diff --git a/backend/main.py b/backend/main.py
index 19cbbc3..b0d5756 100644
--- a/backend/main.py
+++ b/backend/main.py
@@ -410,7 +410,7 @@ async def serve_media(path: str, request: _Request):
         raise _HE(404, "Nicht gefunden.")
     return _media_response(filepath)
 
-APP_VER = "1026"  # muss mit APP_VER in app.js übereinstimmen
+APP_VER = "1027"  # muss mit APP_VER in app.js übereinstimmen
 
 @app.get("/.well-known/assetlinks.json")
 async def assetlinks():
diff --git a/backend/static/js/app.js b/backend/static/js/app.js
index 87cf233..6c62646 100644
--- a/backend/static/js/app.js
+++ b/backend/static/js/app.js
@@ -3,7 +3,7 @@
    Router, State-Management, Navigation, Initialisierung.
    ============================================================ */
 
-const APP_VER     = '1026'; // ← bei jedem Deploy mit Frontend-Änderungen erhöhen
+const APP_VER     = '1027'; // ← bei jedem Deploy mit Frontend-Änderungen erhöhen
 const APP_VERSION = '1.6.0'; // ← semantische Version, wird bei make release gesetzt
 const IS_STAGING  = location.hostname === 'staging.banyaro.app';
 // Cache-Bust-Parameter nach Update-Reload sofort entfernen
diff --git a/backend/static/js/worlds.js b/backend/static/js/worlds.js
index 8e8100c..b5a5f76 100644
--- a/backend/static/js/worlds.js
+++ b/backend/static/js/worlds.js
@@ -1360,6 +1360,9 @@ window.Worlds = (() => {
     const bday     = bdayDog ? _birthdayState(bdayDog.geburtstag) : null;
     const bdayYear = bdayDog?.geburtstag ? new Date().getFullYear() - parseInt(bdayDog.geburtstag.slice(0, 4)) : null;
 
+    // Merken ob ein anderer Hund Geburtstag hat (für Info-Karte unten)
+    const otherBdayDog = (bdayDog && bdayDog.id !== dog.id) ? bdayDog : null;
+
     const [streakRes, diaryRes] = await Promise.allSettled([
       _cachedGet(`streak_${dog.id}`, `/streak/${dog.id}`),
       _cachedGet(`diary_${dog.id}`, `/dogs/${dog.id}/diary?limit=1`),
@@ -1417,6 +1420,22 @@ window.Worlds = (() => {
             </div>
             <div style="justify-self:end;display:flex;align-items:center">${otherAvatarsHtml}</div>
           </div>
+          ${otherBdayDog ? `
+          <div style="margin-top:8px;padding-top:8px;border-top:1px solid rgba(255,255,255,0.12);
+                      display:flex;align-items:center;gap:8px;cursor:pointer"
+               id="wh-other-bday-hint">
+            <span style="animation:by-bday-bounce 1.2s ease-in-out infinite;display:inline-flex">
+              <svg class="ph-icon" style="width:1.2rem;height:1.2rem;color:#f59e0b" aria-hidden="true">
+                <use href="/icons/phosphor.svg#cake"></use>
+              </svg>
+            </span>
+            <span style="font-size:var(--text-xs);color:rgba(255,255,255,0.75);font-weight:600">
+              ${_esc(otherBdayDog.name)} hat ${_birthdayState(otherBdayDog.geburtstag) === 'today' ? 'heute' : 'morgen'} Geburtstag!
+            </span>
+            <svg class="ph-icon" style="width:.9rem;height:.9rem;color:rgba(196,132,58,0.8);margin-left:auto" aria-hidden="true">
+              <use href="/icons/phosphor.svg#arrow-circle-right"></use>
+            </svg>
+          </div>` : ''}
         </div>
         ${bday ? `
         <style>
@@ -1523,6 +1542,19 @@ window.Worlds = (() => {
         if (!isNaN(idx) && idx !== _dogIdx) { _dogIdx = idx; _renderHund(); }
       });
     });
+    // Geburtstag-Hinweis → zum Geburtstagshund wechseln
+    if (otherBdayDog) {
+      if (!document.getElementById('by-bday-anim-style')) {
+        const s = document.createElement('style');
+        s.id = 'by-bday-anim-style';
+        s.textContent = '@keyframes by-bday-bounce{0%,100%{transform:translateY(0) scale(1)}50%{transform:translateY(-5px) scale(1.3)}}';
+        document.head.appendChild(s);
+      }
+      el.querySelector('#wh-other-bday-hint')?.addEventListener('click', () => {
+        const idx = _dogs.indexOf(otherBdayDog);
+        if (idx >= 0) { _dogIdx = idx; _renderHund(); }
+      });
+    }
 
     // Geburtstags-Banner → KI
     el.querySelector('#wh-bday-banner')?.addEventListener('click', () => _openBdayKI(dog, bday));
@@ -1717,6 +1749,26 @@ window.Worlds = (() => {
     `).join('');
   }
 
+  function _updateBdayTabIndicator(bdayDog) {
+    if (bdayDog && !document.getElementById('by-bday-tab-style')) {
+      const s = document.createElement('style');
+      s.id = 'by-bday-tab-style';
+      s.textContent = '@keyframes by-bday-bounce{0%,100%{transform:translateY(0) scale(1)}50%{transform:translateY(-5px) scale(1.25)}}' +
+                      '.wlabel-bday-ic{display:inline-block;animation:by-bday-bounce 1.2s ease-in-out infinite;margin-left:3px;font-size:.85em}';
+      document.head.appendChild(s);
+    }
+    const hundTab = document.querySelectorAll('#world-labels .wlabel')[1];
+    if (!hundTab) return;
+    hundTab.querySelector('.wlabel-bday-ic')?.remove();
+    if (bdayDog) {
+      const ic = document.createElement('span');
+      ic.className = 'wlabel-bday-ic';
+      ic.textContent = '🎂';
+      ic.title = `${bdayDog.name} hat ${_birthdayState(bdayDog.geburtstag) === 'today' ? 'heute' : 'morgen'} Geburtstag!`;
+      hundTab.appendChild(ic);
+    }
+  }
+
   function _fmtDate(d) {
     if (!d) return '';
     try { return new Date(d).toLocaleDateString('de-DE', { day:'numeric', month:'short' }); }
diff --git a/backend/static/sw.js b/backend/static/sw.js
index 8636bf6..018084c 100644
--- a/backend/static/sw.js
+++ b/backend/static/sw.js
@@ -3,7 +3,7 @@
    Offline-Cache + Push Notifications + Tile-Cache
    ============================================================ */
 
-const CACHE_VERSION = 'by-v1026';
+const CACHE_VERSION = 'by-v1027';
 const CACHE_STATIC  = `${CACHE_VERSION}-static`;
 const CACHE_TILES   = 'ban-yaro-tiles-v1';  // bleibt über SW-Updates erhalten
 const CACHE_API     = 'ban-yaro-api-v1';    // API-Response-Cache