diff --git a/backend/routes/dogs.py b/backend/routes/dogs.py
index 1c37b99..9c414d8 100644
--- a/backend/routes/dogs.py
+++ b/backend/routes/dogs.py
@@ -232,15 +232,42 @@ async def get_welcome_dashboard(dog_id: int, user=Depends(get_current_user)):
                    ORDER BY d.datum DESC, d.id DESC, dm.id ASC""",
                 (dog_id,)
             ).fetchall()
+        # Cross-Plattform-stabiles Tagesfoto: einmal pro Tag pro Hund festgelegt
+        # und in daily_photo_cache persistiert. Sobald ein Client (PWA oder
+        # iOS) zum ersten Mal heute zugreift, wird die Wahl gespeichert; alle
+        # weiteren Clients liefern dasselbe Bild.
+        import datetime as _dt2
+        conn.execute("""
+            CREATE TABLE IF NOT EXISTS daily_photo_cache (
+                dog_id    INTEGER NOT NULL,
+                datum     TEXT    NOT NULL,
+                photo_url TEXT    NOT NULL,
+                PRIMARY KEY (dog_id, datum)
+            )
+        """)
+        today_iso = _dt2.date.today().isoformat()
+        cached = conn.execute(
+            "SELECT photo_url FROM daily_photo_cache WHERE dog_id=? AND datum=?",
+            (dog_id, today_iso)
+        ).fetchone()
+
         random_photo = None
-        if photos:
-            import datetime as _dt2
+        if cached and cached["photo_url"]:
+            random_photo = {
+                "url":         cached["photo_url"],
+                "preview_url": preview_url_from(cached["photo_url"]),
+            }
+        elif photos:
             tick       = (_dt2.date.today() - _dt2.date(2024, 1, 1)).days
             chosen_url = photos[tick % len(photos)]["url"]
             random_photo = {
                 "url":         chosen_url,
                 "preview_url": preview_url_from(chosen_url),
             }
+            conn.execute(
+                "INSERT OR IGNORE INTO daily_photo_cache (dog_id, datum, photo_url) VALUES (?, ?, ?)",
+                (dog_id, today_iso, chosen_url)
+            )
 
         # Neuester Tagebucheintrag
         last_diary_row = conn.execute(