diff --git a/vigilar/web/static/css/pet-labeling.css b/vigilar/web/static/css/pet-labeling.css
new file mode 100644
index 0000000..98bd426
--- /dev/null
+++ b/vigilar/web/static/css/pet-labeling.css
@@ -0,0 +1,205 @@
+/* Vigilar — Pet labeling overlay for recording playback */
+
+/* Container: sits on top of the video element, sized to match it */
+.detection-overlay {
+    position: absolute;
+    top: 0;
+    left: 0;
+    width: 100%;
+    height: 100%;
+    pointer-events: none; /* pass-through by default; bboxes re-enable */
+    z-index: 10;
+}
+
+/* Individual bounding box */
+.detection-bbox {
+    position: absolute;
+    pointer-events: auto;
+    cursor: pointer;
+    box-sizing: border-box;
+    border: 2px solid #00d4d4; /* cyan default for animals */
+    border-radius: 3px;
+    transition: border-color 0.15s ease, box-shadow 0.15s ease;
+}
+
+.detection-bbox:hover {
+    border-color: #00ffff;
+    box-shadow: 0 0 0 2px rgba(0, 255, 255, 0.25);
+}
+
+.detection-bbox.bbox-person {
+    border-color: #dc3545;
+}
+
+.detection-bbox.bbox-person:hover {
+    border-color: #ff4d5e;
+    box-shadow: 0 0 0 2px rgba(220, 53, 69, 0.25);
+}
+
+.detection-bbox.bbox-vehicle {
+    border-color: #0d6efd;
+}
+
+.detection-bbox.bbox-vehicle:hover {
+    border-color: #3d8bfd;
+    box-shadow: 0 0 0 2px rgba(13, 110, 253, 0.25);
+}
+
+.detection-bbox.bbox-labeled {
+    border-style: solid;
+    opacity: 0.85;
+}
+
+/* Species + confidence tag shown on top-left corner of bbox */
+.detection-bbox-label {
+    position: absolute;
+    top: -1px;
+    left: -1px;
+    padding: 1px 6px;
+    font-size: 0.7rem;
+    font-weight: 600;
+    line-height: 1.4;
+    background-color: #00d4d4;
+    color: #0d1117;
+    border-radius: 2px 0 2px 0;
+    white-space: nowrap;
+    pointer-events: none;
+    user-select: none;
+    transition: background-color 0.15s ease;
+}
+
+.detection-bbox.bbox-person .detection-bbox-label {
+    background-color: #dc3545;
+    color: #fff;
+}
+
+.detection-bbox.bbox-vehicle .detection-bbox-label {
+    background-color: #0d6efd;
+    color: #fff;
+}
+
+/* "Who is this?" popup card */
+.label-popup {
+    position: fixed; /* positioned by JS via clientX/clientY */
+    z-index: 9999;
+    min-width: 180px;
+    max-width: 240px;
+    background-color: #161b22;
+    border: 1px solid #30363d;
+    border-radius: 8px;
+    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.6);
+    padding: 10px;
+    animation: popup-appear 0.12s ease-out;
+    pointer-events: auto;
+}
+
+@keyframes popup-appear {
+    from {
+        opacity: 0;
+        transform: scale(0.92) translateY(-4px);
+    }
+    to {
+        opacity: 1;
+        transform: scale(1) translateY(0);
+    }
+}
+
+.label-popup-title {
+    font-size: 0.75rem;
+    font-weight: 600;
+    color: #8b949e;
+    text-transform: uppercase;
+    letter-spacing: 0.05em;
+    margin-bottom: 8px;
+    padding-bottom: 6px;
+    border-bottom: 1px solid #30363d;
+}
+
+.label-popup-pets {
+    display: flex;
+    flex-direction: column;
+    gap: 4px;
+    margin-bottom: 6px;
+}
+
+.label-popup-pet-btn {
+    display: flex;
+    align-items: center;
+    gap: 8px;
+    width: 100%;
+    text-align: left;
+    padding: 5px 8px;
+    border: 1px solid #30363d;
+    border-radius: 6px;
+    background: transparent;
+    color: #e6edf3;
+    font-size: 0.85rem;
+    cursor: pointer;
+    transition: background-color 0.1s ease, border-color 0.1s ease;
+}
+
+.label-popup-pet-btn:hover {
+    background-color: #21262d;
+    border-color: #58a6ff;
+}
+
+.label-popup-pet-btn .pet-species-dot {
+    width: 8px;
+    height: 8px;
+    border-radius: 50%;
+    background-color: #00d4d4;
+    flex-shrink: 0;
+}
+
+.label-popup-divider {
+    border: none;
+    border-top: 1px solid #30363d;
+    margin: 6px 0;
+}
+
+.label-popup-action-btn {
+    display: flex;
+    align-items: center;
+    gap: 6px;
+    width: 100%;
+    text-align: left;
+    padding: 5px 8px;
+    border: 1px dashed #30363d;
+    border-radius: 6px;
+    background: transparent;
+    color: #8b949e;
+    font-size: 0.8rem;
+    cursor: pointer;
+    transition: color 0.1s ease, border-color 0.1s ease;
+}
+
+.label-popup-action-btn:hover {
+    color: #e6edf3;
+    border-color: #8b949e;
+}
+
+/* Spinner shown while fetching pets */
+.label-popup-loading {
+    text-align: center;
+    color: #8b949e;
+    font-size: 0.8rem;
+    padding: 8px 0;
+}
+
+/* Confirmation flash on successful label */
+.label-confirm-flash {
+    position: absolute;
+    top: 0;
+    left: 0;
+    right: 0;
+    bottom: 0;
+    border-radius: 3px;
+    background-color: rgba(0, 212, 212, 0.2);
+    pointer-events: none;
+    animation: confirm-flash 0.5s ease-out forwards;
+}
+
+@keyframes confirm-flash {
+    0% { opacity: 1; }
+    100% { opacity: 0; }
+}
diff --git a/vigilar/web/static/js/pet-labeling.js b/vigilar/web/static/js/pet-labeling.js
new file mode 100644
index 0000000..e785599
--- /dev/null
+++ b/vigilar/web/static/js/pet-labeling.js
@@ -0,0 +1,377 @@
+/* Vigilar — Pet labeling overlay for recording playback
+ *
+ * Integration:
+ *   1. Add to the page:
+ *        <link rel="stylesheet" href="{{ url_for('static', filename='css/pet-labeling.css') }}">
+ *        <script src="{{ url_for('static', filename='js/pet-labeling.js') }}"></script>
+ *
+ *   2. Wrap the <video> element in a position:relative container and add
+ *      `data-pet-labeling="true"` to that container, along with a
+ *      `data-detections` attribute holding the JSON array of detections:
+ *
+ *        <div class="position-relative" data-pet-labeling="true"
+ *             data-detections='[{"id":1,"species":"cat","confidence":0.92,
+ *                                "bbox":[0.1,0.15,0.35,0.6]}]'>
+ *          <video id="player-video" class="w-100" controls></video>
+ *        </div>
+ *
+ *      bbox values are fractional [x1, y1, x2, y2] relative to video dimensions
+ *      (same convention as YOLO normalised coords).
+ *
+ *   3. The module self-initialises on DOMContentLoaded and also exposes
+ *      window.PetLabeling for manual calls:
+ *
+ *        PetLabeling.init(containerEl, detectionsArray);
+ *        PetLabeling.updateDetections(containerEl, detectionsArray);
+ */
+
+(function () {
+    'use strict';
+
+    // -------------------------------------------------------------------------
+    // Constants
+    // -------------------------------------------------------------------------
+
+    const ANIMAL_SPECIES = new Set(['cat', 'dog', 'bird', 'rabbit', 'hamster', 'fish', 'animal']);
+
+    // Map species to bbox CSS class (animals get default cyan)
+    function bboxClass(species) {
+        if (species === 'person') return 'bbox-person';
+        if (species === 'vehicle' || species === 'car' || species === 'truck') return 'bbox-vehicle';
+        return ''; // cyan default (animals / unknown)
+    }
+
+    // -------------------------------------------------------------------------
+    // Pets cache — fetched once per page load, filtered by species on demand
+    // -------------------------------------------------------------------------
+
+    let _petsCache = null; // null = not fetched yet; [] = fetched, none found
+
+    async function fetchPets() {
+        if (_petsCache !== null) return _petsCache;
+        try {
+            const resp = await fetch('/pets/api/status');
+            if (!resp.ok) throw new Error(`HTTP ${resp.status}`);
+            const data = await resp.json();
+            _petsCache = Array.isArray(data.pets) ? data.pets : [];
+        } catch (e) {
+            _petsCache = [];
+        }
+        return _petsCache;
+    }
+
+    function petsForSpecies(pets, species) {
+        if (!species) return pets;
+        // For generic "animal" detections show all pets; otherwise filter by species
+        if (ANIMAL_SPECIES.has(species) && species !== 'animal') {
+            return pets.filter(p => p.species && p.species.toLowerCase() === species.toLowerCase());
+        }
+        return pets;
+    }
+
+    // -------------------------------------------------------------------------
+    // Active popup — only one at a time
+    // -------------------------------------------------------------------------
+
+    let _activePopup = null;
+
+    function dismissActivePopup() {
+        if (_activePopup) {
+            _activePopup.remove();
+            _activePopup = null;
+        }
+    }
+
+    // -------------------------------------------------------------------------
+    // Label popup
+    // -------------------------------------------------------------------------
+
+    async function showLabelPopup(bbox, detection, anchorEl) {
+        dismissActivePopup();
+
+        const popup = document.createElement('div');
+        popup.className = 'label-popup';
+        popup.innerHTML = `
+            <div class="label-popup-title">
+                <i class="bi bi-tag-fill me-1"></i>Who is this?
+            </div>
+            <div class="label-popup-loading">
+                <span class="spinner-border spinner-border-sm me-1" role="status"></span>
+                Loading…
+            </div>`;
+        document.body.appendChild(popup);
+        _activePopup = popup;
+
+        // Position near the clicked bbox, keep on screen
+        positionPopup(popup, anchorEl);
+
+        // Fetch pets (cached after first call)
+        const allPets = await fetchPets();
+        if (_activePopup !== popup) return; // dismissed while loading
+
+        const pets = petsForSpecies(allPets, detection.species);
+
+        let petsHtml = '';
+        if (pets.length > 0) {
+            petsHtml = pets.map(p => `
+                <button class="label-popup-pet-btn" data-pet-id="${p.id}" data-pet-name="${escHtml(p.name)}">
+                    <span class="pet-species-dot"></span>
+                    ${escHtml(p.name)}
+                    <small class="ms-auto text-muted">${escHtml(p.species || '')}</small>
+                </button>`).join('');
+        }
+
+        popup.innerHTML = `
+            <div class="label-popup-title">
+                <i class="bi bi-tag-fill me-1"></i>Who is this?
+                <small class="float-end text-muted text-capitalize">${escHtml(detection.species || 'animal')}</small>
+            </div>
+            <div class="label-popup-pets">
+                ${petsHtml}
+            </div>
+            ${pets.length > 0 ? '<hr class="label-popup-divider">' : ''}
+            <button class="label-popup-action-btn" data-action="unknown">
+                <i class="bi bi-question-circle"></i>Unknown
+            </button>
+            <button class="label-popup-action-btn mt-1" data-action="new-pet">
+                <i class="bi bi-plus-circle"></i>+ New Pet
+            </button>`;
+
+        // Re-position after content change (height may differ)
+        positionPopup(popup, anchorEl);
+
+        // Pet selection
+        popup.querySelectorAll('.label-popup-pet-btn').forEach(btn => {
+            btn.addEventListener('click', (e) => {
+                e.stopPropagation();
+                const petId = btn.dataset.petId;
+                const petName = btn.dataset.petName;
+                applyLabel(detection, petId, petName, bbox);
+                dismissActivePopup();
+            });
+        });
+
+        // Unknown
+        const unknownBtn = popup.querySelector('[data-action="unknown"]');
+        if (unknownBtn) {
+            unknownBtn.addEventListener('click', (e) => {
+                e.stopPropagation();
+                applyLabel(detection, 'unknown', 'Unknown', bbox);
+                dismissActivePopup();
+            });
+        }
+
+        // New Pet — open the pets dashboard in a new tab
+        const newPetBtn = popup.querySelector('[data-action="new-pet"]');
+        if (newPetBtn) {
+            newPetBtn.addEventListener('click', (e) => {
+                e.stopPropagation();
+                window.open('/pets/', '_blank');
+                dismissActivePopup();
+            });
+        }
+    }
+
+    function positionPopup(popup, anchorEl) {
+        const rect = anchorEl.getBoundingClientRect();
+        const popW = popup.offsetWidth || 200;
+        const popH = popup.offsetHeight || 160;
+        const margin = 8;
+
+        // Prefer right of bbox; fall back to left
+        let left = rect.right + margin;
+        if (left + popW > window.innerWidth - margin) {
+            left = rect.left - popW - margin;
+        }
+        if (left < margin) left = margin;
+
+        // Align top with bbox; clamp to viewport
+        let top = rect.top;
+        if (top + popH > window.innerHeight - margin) {
+            top = window.innerHeight - popH - margin;
+        }
+        if (top < margin) top = margin;
+
+        popup.style.left = `${left}px`;
+        popup.style.top = `${top}px`;
+    }
+
+    // -------------------------------------------------------------------------
+    // Label API call
+    // -------------------------------------------------------------------------
+
+    async function applyLabel(detection, petId, petName, bboxEl) {
+        // Optimistic UI: update the label tag immediately
+        const labelTag = bboxEl.querySelector('.detection-bbox-label');
+        if (labelTag) {
+            labelTag.textContent = petId === 'unknown' ? 'Unknown' : petName;
+        }
+        bboxEl.classList.add('bbox-labeled');
+
+        // Confirmation flash
+        const flash = document.createElement('div');
+        flash.className = 'label-confirm-flash';
+        bboxEl.appendChild(flash);
+        flash.addEventListener('animationend', () => flash.remove());
+
+        if (!detection.id || petId === 'unknown') return;
+
+        try {
+            await fetch(`/pets/${detection.id}/label`, {
+                method: 'POST',
+                headers: { 'Content-Type': 'application/json' },
+                body: JSON.stringify({ pet_id: petId }),
+            });
+        } catch (e) {
+            // Silently fail — offline mode
+        }
+    }
+
+    // -------------------------------------------------------------------------
+    // Overlay rendering
+    // -------------------------------------------------------------------------
+
+    function renderOverlay(container, detections) {
+        // Remove any existing overlay
+        const existing = container.querySelector('.detection-overlay');
+        if (existing) existing.remove();
+
+        if (!detections || detections.length === 0) return;
+
+        const video = container.querySelector('video');
+        if (!video) return;
+
+        const overlay = document.createElement('div');
+        overlay.className = 'detection-overlay';
+        container.appendChild(overlay);
+
+        // Draw bboxes sized to the video's rendered dimensions
+        function drawBboxes() {
+            overlay.innerHTML = '';
+
+            const vRect = video.getBoundingClientRect();
+            const cRect = container.getBoundingClientRect();
+
+            // Offset from container origin
+            const offX = vRect.left - cRect.left;
+            const offY = vRect.top - cRect.top;
+            const vW = vRect.width;
+            const vH = vRect.height;
+
+            if (vW === 0 || vH === 0) return;
+
+            detections.forEach(det => {
+                const [x1f, y1f, x2f, y2f] = det.bbox || [0, 0, 1, 1];
+
+                const left = offX + x1f * vW;
+                const top = offY + y1f * vH;
+                const width = (x2f - x1f) * vW;
+                const height = (y2f - y1f) * vH;
+
+                const bbox = document.createElement('div');
+                bbox.className = `detection-bbox ${bboxClass(det.species)}`.trimEnd();
+                bbox.style.cssText = `
+                    left: ${left}px;
+                    top: ${top}px;
+                    width: ${width}px;
+                    height: ${height}px;
+                `;
+
+                const confidence = det.confidence !== undefined
+                    ? ` ${Math.round(det.confidence * 100)}%`
+                    : '';
+                const labelText = det.pet_name
+                    ? det.pet_name
+                    : `${det.species || 'animal'}${confidence}`;
+
+                const label = document.createElement('div');
+                label.className = 'detection-bbox-label';
+                label.textContent = labelText;
+                bbox.appendChild(label);
+
+                // Only show "Who is this?" popup for animal detections
+                if (!det.species || ANIMAL_SPECIES.has(det.species.toLowerCase())) {
+                    bbox.addEventListener('click', (e) => {
+                        e.stopPropagation();
+                        showLabelPopup(bbox, det, bbox);
+                    });
+                }
+
+                overlay.appendChild(bbox);
+            });
+        }
+
+        // Draw immediately and on video resize/metadata
+        drawBboxes();
+        video.addEventListener('loadedmetadata', drawBboxes);
+        const ro = new ResizeObserver(drawBboxes);
+        ro.observe(video);
+
+        // Store cleanup handle
+        overlay._roCleanup = () => ro.disconnect();
+    }
+
+    // -------------------------------------------------------------------------
+    // Public API
+    // -------------------------------------------------------------------------
+
+    function init(container, detections) {
+        if (!container) return;
+        renderOverlay(container, detections);
+    }
+
+    function updateDetections(container, detections) {
+        if (!container) return;
+        const old = container.querySelector('.detection-overlay');
+        if (old && old._roCleanup) old._roCleanup();
+        renderOverlay(container, detections);
+    }
+
+    // -------------------------------------------------------------------------
+    // Auto-init: find all [data-pet-labeling="true"] containers on page load
+    // -------------------------------------------------------------------------
+
+    function autoInit() {
+        document.querySelectorAll('[data-pet-labeling="true"]').forEach(container => {
+            let detections = [];
+            const raw = container.dataset.detections;
+            if (raw) {
+                try { detections = JSON.parse(raw); } catch (e) { detections = []; }
+            }
+            init(container, detections);
+        });
+    }
+
+    if (document.readyState === 'loading') {
+        document.addEventListener('DOMContentLoaded', autoInit);
+    } else {
+        autoInit();
+    }
+
+    // Dismiss popup when clicking outside
+    document.addEventListener('click', (e) => {
+        if (_activePopup && !_activePopup.contains(e.target)) {
+            dismissActivePopup();
+        }
+    });
+
+    document.addEventListener('keydown', (e) => {
+        if (e.key === 'Escape') dismissActivePopup();
+    });
+
+    // -------------------------------------------------------------------------
+    // Helpers
+    // -------------------------------------------------------------------------
+
+    function escHtml(str) {
+        if (!str) return '';
+        return String(str)
+            .replace(/&/g, '&amp;')
+            .replace(/</g, '&lt;')
+            .replace(/>/g, '&gt;')
+            .replace(/"/g, '&quot;');
+    }
+
+    // Expose public API
+    window.PetLabeling = { init, updateDetections };
+})();
diff --git a/vigilar/web/templates/recordings.html b/vigilar/web/templates/recordings.html
index eedf3f0..8b9948e 100644
--- a/vigilar/web/templates/recordings.html
+++ b/vigilar/web/templates/recordings.html
@@ -1,6 +1,10 @@
 {% extends "base.html" %}
 {% block title %}Vigilar — Recordings{% endblock %}
 
+{% block head %}
+<link rel="stylesheet" href="{{ url_for('static', filename='css/pet-labeling.css') }}">
+{% endblock %}
+
 {% block content %}
 <div class="d-flex justify-content-between align-items-center mb-3">
     <h5 class="mb-0"><i class="bi bi-camera-video me-2"></i>Recordings</h5>
@@ -38,7 +42,10 @@
         </button>
     </div>
     <div class="card-body p-0">
-        <video id="player-video" class="w-100" controls></video>
+        <!-- data-pet-labeling and data-detections are updated by JS when a recording is loaded -->
+        <div class="position-relative" id="player-video-wrap" data-pet-labeling="true" data-detections="[]">
+            <video id="player-video" class="w-100" controls></video>
+        </div>
     </div>
 </div>
 
@@ -90,6 +97,7 @@
 </div>
 
 <script src="{{ url_for('static', filename='js/timeline.js') }}"></script>
+<script src="{{ url_for('static', filename='js/pet-labeling.js') }}"></script>
 <script>
 (function() {
     'use strict';
@@ -112,11 +120,35 @@
         playerVideo.src = '';
     });
 
+    const playerVideoWrap = document.getElementById('player-video-wrap');
+
+    async function loadDetections(recordingId) {
+        try {
+            const resp = await fetch(`/recordings/${recordingId}/detections`);
+            if (!resp.ok) return [];
+            return await resp.json();
+        } catch (e) {
+            return [];
+        }
+    }
+
     function handleSegmentClick(seg) {
         playerCard.classList.remove('d-none');
         playerTitle.textContent = `Recording #${seg.id} (${seg.type || 'motion'})`;
         playerVideo.src = `/recordings/${seg.id}/download`;
         playerVideo.play().catch(() => {});
+
+        // Reset overlay while detections load
+        if (window.PetLabeling) {
+            PetLabeling.updateDetections(playerVideoWrap, []);
+        }
+
+        // Fetch detections for this recording and render overlay
+        loadDetections(seg.id).then(detections => {
+            if (window.PetLabeling) {
+                PetLabeling.updateDetections(playerVideoWrap, detections);
+            }
+        });
     }
 
     function loadTimeline() {