We had Bitsy spayed about four months ago and she "chunked up" a bit too. I have noticed that she just acts like she feels better in general...she seems to have more energy but that's good cause she used to do nothing but lay around so we are happy that she acts like she feels good..also..she has started doing this talking thing when she wants to be petted or held..don't know how to explain it but it's soooooo cute. I just think she feels better since she was spayed and definitly enjoys her food more, LOL
She's not as finicky!