There's no question regarding the benefits of male cat neutering. "Fixed" male cats seldom engage in the undesirable behaviors of intact males, including fighting, urine spraying, roaming and yowling. Neutering also reduces the chance of disease transmission due to fighting. While veterinarians traditionally neutered cats at about 6 months of age, early neutering is becoming more acceptable and common. Once your male kitten weighs at least 3 pounds, he's a candidate for this simple surgery.
If you adopted your male kitten from a shelter, there's a good chance he was already neutered. Many shelters are neutering -- and spaying -- kittens early to eliminate the possibility that adopters won't sterilize their pets and the cats continue contributing to the feline overpopulation problem. The ASPCA recommends neutering kittens as young as 2 months old. If you don't want to neuter your kitten when he's that small, make sure you do so before he reaches the age of 6 months. Not only is that the age of puberty for most male cats, but it's also when they might start urine spraying and marking.