Don't ask me, I'm the owner of a fat Pug! I've been working on the problem though and I think she's finally losing weight. I'm not sure if Morty put on a few. I thought he did but I think it was just his winter coat. Harley and Jimmy are slim and trim and never gain a pound (accept when we first got them, but they both needed it)

I think your pup looks fine, but the pic is a little dark.