We recommend male animals be neutered between 4 and 8 months of age if they are not to be used for breeding. Smaller breeds such as Poodles and Yorkies are done a bit later than larger breeds for anesthetic safety. We have found that neutering has virtually no disadvantages and has many advantages. Male cats are less likely to emit a strong odour and to spray. They have less desire to fight and therefore have fewer abscesses. Male dogs are less likely to roam and exhibit intermale aggression. Perhaps most importantly ,your male dog will be at no risk of testicular or prostatic cancer if neutered. Weight gain may be a problem if your neutered male is a couch potato by nature,however we have not found that to be a problem if our clients are made aware of how to avoid overfeeding their animals.