diff --git a/backend/static/css/components.css b/backend/static/css/components.css
index f1f3d1e..ba5dfd0 100644
--- a/backend/static/css/components.css
+++ b/backend/static/css/components.css
@@ -670,6 +670,26 @@ textarea.form-control {
 }
 @media (min-width: 768px) { .modal-handle { display: none; } }
 
+.modal-overlay--fullscreen {
+  padding: 0;
+}
+.modal-overlay--fullscreen .modal {
+  width: 100%;
+  max-width: 100%;
+  height: 100%;
+  max-height: 100%;
+  border-radius: 0;
+  border: none;
+}
+.modal-overlay--fullscreen .modal-handle { display: none; }
+
+.ausweis-frame {
+  width:  100%;
+  height: 100%;
+  border: none;
+  flex:   1 1 auto;
+}
+
 .modal-header {
   padding:        var(--space-4) var(--space-6);
   border-bottom:  1px solid var(--c-border-light);
diff --git a/backend/static/js/app.js b/backend/static/js/app.js
index e4bb234..2a7a03d 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 = '119'; // ← bei jedem Deploy mit Frontend-Änderungen erhöhen
+const APP_VER = '120'; // ← bei jedem Deploy mit Frontend-Änderungen erhöhen
 
 const App = (() => {
 
diff --git a/backend/static/js/pages/dog-profile.js b/backend/static/js/pages/dog-profile.js
index 9909b0a..3123faf 100644
--- a/backend/static/js/pages/dog-profile.js
+++ b/backend/static/js/pages/dog-profile.js
@@ -251,7 +251,7 @@ window.Page_dog_profile = (() => {
     });
 
     document.getElementById('dp-ausweis-btn')?.addEventListener('click', () => {
-      window.open(`/ausweis/${dog.id}`, '_blank');
+      _showAusweisModal(dog.id);
     });
 
     document.getElementById('dp-share-btn')?.addEventListener('click', () => {
@@ -293,6 +293,19 @@ window.Page_dog_profile = (() => {
     });
   }
 
+  // ----------------------------------------------------------
+  // AUSWEIS
+  // ----------------------------------------------------------
+  function _showAusweisModal(dogId) {
+    UI.modal.open({
+      title: 'Heimtierausweis',
+      body: `<iframe src="/ausweis/${dogId}" class="ausweis-frame" title="Heimtierausweis"></iframe>`,
+      footer: `<button class="btn btn-secondary" onclick="UI.modal.close()">Schließen</button>
+               <a href="/ausweis/${dogId}" target="_blank" class="btn btn-ghost">${UI.icon('printer')} Drucken</a>`,
+      size: 'fullscreen',
+    });
+  }
+
   // ----------------------------------------------------------
   // TEILEN
   // ----------------------------------------------------------
diff --git a/backend/static/js/ui.js b/backend/static/js/ui.js
index 22f66d0..8f1101e 100644
--- a/backend/static/js/ui.js
+++ b/backend/static/js/ui.js
@@ -55,11 +55,11 @@ const UI = (() => {
   const modal = (() => {
     let _current = null;
 
-    function open({ title, body, footer, onClose } = {}) {
+    function open({ title, body, footer, onClose, size } = {}) {
       close(); // vorheriges schließen
 
       const overlay = document.createElement('div');
-      overlay.className = 'modal-overlay';
+      overlay.className = 'modal-overlay' + (size ? ` modal-overlay--${size}` : '');
       overlay.innerHTML = `
         <div class="modal" role="dialog" aria-modal="true">
           <div class="modal-handle"></div>
diff --git a/backend/static/sw.js b/backend/static/sw.js
index bda238c..d900237 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-v146';
+const CACHE_VERSION = 'by-v147';
 const CACHE_STATIC  = `${CACHE_VERSION}-static`;
 const CACHE_TILES   = 'ban-yaro-tiles-v1';  // bleibt über SW-Updates erhalten