NOPE! Although, without some changes in behavior, it can happen. Spaying or neutering your dog or cat doesn't cause your pet to become overweight or obese. However, neutering is linked to an increased risk of weight gain if no change is made to what and how much you feed your pet after the surgery.
Does neutering make dog smaller?
Early-age neutering does not stunt growth in dogs or cats (a once-held belief), but may alter metabolic rates in cats. The anaesthetic and surgical procedures are apparently safe for young puppies and kittens; morbidity is lower and recovery is faster than in adult animals.
Does neutering a dog affect muscle growth?
When we neuter them young, and we take away that hormone, they become very much like a female dog. They don't have the defined muscle mass that a male dog is supposed to have. This in turn can cause a lot more incidences of hip dysplasia and cruciate ligament's.
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