Loki is the same way!! He should be around 12 pounds and he's been around 12.5 and my dad came over today and said, "Wow Loki's gained a pound or two" and I totally didn't believe him so I put Loki on the shipping scale (Loki loved that - ha) and he was ALMOST 14 pounds. Ugh. This is the dog who is always hungry unless hes sleeping. He knows he gets a treat after going outside and if I don't give him one he will sit there and stare at the treat jar. He loves walks but walks mean "pee on everything and go home" I feel bad because he and Sammy eat almost the same amount and she is half his size (of course petite as ever!) but she never stops moving.
I might do the green bean diet - replace some of his kibble with green beans... I admit I should walk them more but it's cold and they walk at completely different paces. Sammy walks slowly (she's short!) but at least she walks. Loki RUNS ahead and then abruptly stops to pee on something. I should walk them separately and then I would get twice the exercise, but I think I'm the lazy one