So I have been told by a few vets that spaying or neutering does not cause weight gain. However, every dog I have ever known to be spayed has blown up like a balloon after being fixed. I would appreciate hearing your guys' experiences with this. Did your dog gain weight? Did your dog NOT gain weight? Any feedback is welcome. This is the only thing holding me back from getting my dog spayed. I don't want her weight to be and issue for joint problems later on down the line.