Some cats (males in particular) will gain weight more easily and may even become obese after neurtering or spaying, so the cats food intake must be monitored and altered according to activity level. Cats that have a belly pouch (not sure of the actual term for it) seem to be more prone to this because they "gorge". The belly pouch is a genetic carryover from cats in the wild--wild cats hunt for days and weeks, sometimes without eating much of anything, depending on game availablility. When they do make a kill, they gorge, eating well past satisfaction while the game is still edible and before is has been eaten by other animals. This belly pouch (loose skin which hangs down lower than the rest of the stomach and chest, just in front of the rear legs) is reserve space for a full gut. The instinct for gorging shows up in some cats after altering--mostly males, who in the wild have food brought to them and are the first to eat, while females are usually the hunters and eat what is left after the males and cubs. Other than that, altering is HIGHLY beneficial for the animal. It curbs the urges to roam, fight, or spray, and because it elimates sexual tension, the animal lives much longer and healthier. Unspayed/unneutered domestic animals in general (not just cats) can often be cross and aggressive or depressed and neurotic.
Source(s):
Numerous books about animals, converstations with vetinarians and other animal experts, internet research. I'm an assistant librarian.
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