sometime i can see my dog's last rib or 2 and the vet siad shes healthy and and still woodnt hurt her to lose MORE WEIGHT! i think its normal but if you want him to eat it what i do with my dog is let her lick a peice of dog food then i drop it and she eats that peice and decides eating the whole bowl wont hurt lol but that might just be my dog...eggs works great so does gravy