Here are some things to remember:
* Neutering is an internal procedure: The veterinarian removes the testicles in male cats and the ovaries and uterus in female cats. These are all internal organs, so there are no visible changes.
* Behavioral changes are a better indicator: Neutered cats typically become less likely to spray urine, roam, or fight with other cats. However, these changes can vary between cats.
* A microchip or tattoo is the only reliable way to know: Your vet will often microchip your cat during the neutering process. A tattoo may also be given in the ear. These are the only ways to definitively tell if a cat has been neutered.
If you are looking to adopt a cat and want to know if it's neutered, be sure to ask the shelter or breeder. They can provide you with the information you need.