At what age should I have my dog or cat spayed or neutered?

The best age for both species is around 4-5 months old. There are many medical and behavioral reasons why it is healthiest for females to be neutered before her first heat, and males before they reach puberty. Puppies and kittens can be neutered even as young as 6 weeks of age, but we prefer to let them get their puppy and kitten immunizations underway, and that they be clear of parasites before a major surgery.

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