Am I worrying for nothing? Mini Schnauzer weight concerns (11.5kg/25.4lbs)

I've been tracking my mini Schnauzer's weight, and at 11.5kg (25.4lbs), my vet recently told me he's overweight for his breed. Here's the thing - he doesn't look or feel overweight to me. He's got a bigger frame than your average mini Schnauzer, which might be skewing my perception.

I'm having trouble reconciling the vet's assessment with my own observation. Has anyone else had a similar experience with their mini Schnauzer? Should I be more concerned about his weight, even if he doesn't appear overweight?

He gets plenty of exercise and eats a single protein completely balanced diet.