Teeka was the same way at that age. After I had her spayed she gained a 1/2 pound in 1 month and her wait was exactly 4 lbs. She is now 11 months and she lost most of that weight and is down to 3.8 pounds. I think it is because we are outside and she does alot of running & exploring, burning calories! If she has a small bone structure, she might fill out some after her spay but then she might run it off!
Talk to your vet to see what he says.
