As a result of recent research studies, the American Veterinary Medical Association’s expert advisory boards for spay and neuter issues released a position statement as well as a detailed basis for this position statement in 2008 firmly opposed to mandatory spay/neuter laws, which included:
Position Statement on Mandatory Spay-Neuter
The American College of Theriogenologists and The Society for Theriogenology believe that companion animals not intended for breeding should be spayed or neutered; however, both organizations believe that the decision to spay or neuter a pet must be made on a case by case basis, and this decision should be made between the pet’s owner and its veterinarian, taking into consideration the pet’s age, breed, sex, health status, intended use, household environment and temperament […]
Therefore, the decision to spay or neuter a dog or cat should be made solely by the pet’s owner with the direct input of their veterinarian and will be dependent on each particular animal’s situation.
and
Although both organizations believe that most companion animals should be spayed or neutered, the ACT and SFT also strongly believe that it is not in the best interest of the animals to produce legislation regarding medical treatments, Therefore, both organizations oppose mandatory spay/neuter programs.