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Unless he's got some kind of medical issue, when animal or human is fat, it's because of too many calories in vs not enough being used. You say he's on a diet - then how about increasing the amount of exercise he's getting? How much exercise does he get every day? And you say he's not eating too much - but how much is he eating (really)? Maybe he's not eating too much out of his bowl, but is he getting lots of snacks? It all adds up. Be real aware of every morsel he puts in his mouth, and try really increasing his exercise - then watch, I bet you'll see results.


Typically dogs do need fewer calories once spayed/neutered. Of course that is no excuse for being overweight! The dog isn't the one putting the amount of food down, the owner is...
If the dog truly is not eating that much food (and I've known dogs that are 50lbs that only need to eat 1.5cups per day) then I would take him to the vet for a thyroid checkup.
