Is my basset fat?

The other day at the vet he weighed 82 lbs according the scale. Vet said she’d like to see him lose a little weight. We usually walk for about 30 min a day which usually ends up being 1-1.5 miles depending on the sniffs. As far as food, he’s fed twice a day and I put some brewers yeast tablets and seameal in his food for his skin, coat and digestion.