With the cold coming on, I guess I wouldn't worry too much about a little bit of extra weight. We purposely added some pounds to our Joshua. The nutritionist came out and thought he should have some extra pounds before it got really cold. I think I'd ask the vet if you could worry more about changing that fat to muscle and not worry so much about getting the weight off as we head into the cold weather.
What about some carrots? We treat some with a large bag of peppermint flavored horse treats (but not much...I purchased the 20 lb bag in August and feed four horse and two or three dogs from the same treat bag. (Yes, the dog things those things are heavenly). We also use peppermints. But, again, we don't give treats often.
Are you absolutely sure you wanna mess with my carrots?