No, I've never seen or heard of any studies to do with obesity and black and white cats. I know that there are some breeds/animals that are prone to certain diseases, but as most black and white shelter cats would likely just be mixes of random breeds, I don't really see anything too common there.
I think the fact that they are shelter cats would more likely have something to do with it. Also, the longer animals are not active, the less they burn. If they were strays before being put in the shelter, that could have something to do with it as well. My grandmother took in a lot of strays throughout several years, and a lot of them tended to eat whatever they saw; they didn't have an off button. We always suspected it was because with being strays, they never knew when or how much they'd be able to find to eat, so to them like a survival thing - even after having a home for years. So if you mix that with being cooped up for possibly months, that could definitely contribute.
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Last edited by Poetess; 06-14-2012 at 02:26 PM.