We took in a 8-9 month old cat that is the size of a 3 month old kitten. She is of good weight, healthy, no problems etc other than she is just sooooo short for her age. There are a few smaller cats roaming the neighborhood as well so is it possible she may be a Munchkin mixed cat? She eats fine and gains weight but hasnt grown an inch since Ive had her. She is about 7-8 inches tall. Is there any rare disease etc that could make her growth stunted?