diff --git a/src/app.js b/src/app.js
index ed81050..9242346 100644
--- a/src/app.js
+++ b/src/app.js
@@ -291,6 +291,24 @@
     return `${wk} (${monthPhrase}) old`;
   }
 
+  // Compact one-line age for space-tight spots (header): keeps the weeks + months
+  // breakdown but abbreviated — "16 wk · 3 mo 3 wk", "5 mo 2 wk", "3 wk".
+  function formatAgeShort(birthday, at) {
+    const a = ageParts(birthday, at);
+    if (!a) return "";
+    const wk = `${a.weeks} wk`;
+    if (a.months < 1) return wk;
+    const mo = `${a.months} mo${a.remWeeks > 0 ? ` ${a.remWeeks} wk` : ""}`;
+    if (a.months >= 4) return mo;
+    return `${wk} · ${mo}`;
+  }
+
+  // Weeks-only age for dense lists (weight rows): "16 wk".
+  function formatAgeWeeks(birthday, at) {
+    const a = ageParts(birthday, at);
+    return a ? `${a.weeks} wk` : "";
+  }
+
   // Rough age-based daily sleep goal (hours), for the trend chart's goal band:
   // 0–8 weeks 20–22h, 8–16 weeks 18–20h, then 16–18h to 6 months and 14–16h to
   // 12 months. No birthday (or an adult dog) → no goal.
@@ -1669,7 +1687,7 @@
       li.className = "ww weight-ww";
       const date = document.createElement("span");
       date.className = "ww-range";
-      const age = formatAge(birthday, w.at);
+      const age = formatAgeWeeks(birthday, w.at);
       const dateStr = new Date(w.at).toLocaleDateString(undefined, { month: "short", day: "numeric" });
       date.textContent = age ? `${dateStr} · ${age}` : dateStr;
       const val = document.createElement("span");
@@ -1888,7 +1906,7 @@
     const ageEl = document.getElementById("puppy-age");
     title.textContent = cfg.name ? `🐶 ${cfg.name}` : "🐶 Puppy Tracker";
     document.title = cfg.name ? `${cfg.name} · Puppy Tracker` : "Puppy Tracker";
-    const ageText = formatAge(cfg.birthday);
+    const ageText = formatAgeShort(cfg.birthday);
     ageEl.textContent = ageText;
     ageEl.hidden = !ageText;
     // Use the puppy's name in the sleep-timeline heading rather than assuming a
diff --git a/src/changelog.json b/src/changelog.json
index debea2d..6c68b13 100644
--- a/src/changelog.json
+++ b/src/changelog.json
@@ -1,4 +1,5 @@
 [
+  { "date": "2026-08-01", "text": "Tidied the header on long names and ages — the name now truncates instead of shoving the buttons, and the age reads as a compact \"16 wk · 3 mo 3 wk\"; weight-log rows are a single line again (\"Aug 1 · 16 wk\")" },
   { "date": "2026-07-26", "text": "Added a fan-chart view of the pedigree (toggle it in the header): your dog at the centre with each generation fanning outward as a ring, so many generations fit at once without the tree sprawling sideways — tap a wedge for that dog, and repeated ancestors keep their colour" },
   { "date": "2026-07-26", "text": "Added a Collapse all / Expand all toggle to the pedigree, to fold the whole tree down to your dog or open every branch at once" },
   { "date": "2026-07-26", "text": "The pedigree is now zoomable — use the +/− buttons, ⌘/Ctrl-scroll, or pinch on a phone — to fit a wide tree on screen or zoom in for detail; your zoom level is remembered" },
diff --git a/src/style.css b/src/style.css
index 2a364a2..1544d90 100644
--- a/src/style.css
+++ b/src/style.css
@@ -78,13 +78,24 @@ h1 {
   display: flex;
   flex-direction: column;
   gap: 2px;
+  flex: 1 1 auto;
   min-width: 0;
 }
+/* Truncate the name so a long one never runs into the action buttons. Scoped to
+   the header title so the auth-screen heading is unaffected. */
+#app-title {
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
 
 .puppy-age {
   font-size: 0.8rem;
   color: var(--muted);
   font-variant-numeric: tabular-nums;
+  /* One line in the common case; on a very narrow screen it wraps rather than
+     truncating, so the age is never cut off. The name (#app-title) is what
+     truncates to keep the buttons clear. */
 }
 
 .header-actions {
@@ -644,7 +655,16 @@ dialog menu {
 .weight-summary .stat-value.up   { color: var(--gain); }
 .weight-summary .stat-value.down { color: var(--danger); }
 .ww.weight-ww { cursor: pointer; }
-.ww.weight-ww .ww-dur { text-align: right; }
+/* Keep each weight row to one line: the date/age column shrinks and ellipses,
+   the weight value stays a fixed size, right-aligned and always visible. */
+.ww.weight-ww .ww-range {
+  min-width: 0;
+  flex: 1;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+.ww.weight-ww .ww-dur { flex: 0 0 auto; text-align: right; }
 
 .legend {
   display: flex;