"Predisposition to obesity" or not, any vet will will tell you that this cat's at pretty high risk for developing diabetes, and all the complications that go with it, if the owner doesn't change the cat's diet. Sometimes all it takes is choosing a "weight control" variety, and letting the cat continue to free feed.
I don't mean to sound judgemental. At least the guy is keeping the cat warm through winters, which is more than I can say for jerks who abandon kittens in the freezing cold of winter, etc. On the other hand, let's not pretend that a "predisposition" to anything is in any way a reasonable abdication of responsibility.
Happy Lil' Elk Frolics in a Pond
EDIT: Hey, look, a version that actually loads. (http://www.youtube.com/watch?v=5GFv1bl2fto)
Fat cat climbs ladder
I don't mean to sound judgemental. At least the guy is keeping the cat warm through winters, which is more than I can say for jerks who abandon kittens in the freezing cold of winter, etc. On the other hand, let's not pretend that a "predisposition" to anything is in any way a reasonable abdication of responsibility.