Health benefits of desexing are obviously important, however, there are behavioural benefits that cannot be ignored.
Desexed male dogs and cats tend to be less territorial, which makes them less aggressive and less prone to marking their territory. Both male and female dogs and cats do not roam as much, which means there is less chance of getting into a fight with another animal, or getting hit by a car.
Most often it best to desex your pet while they are younger. Your vet will let you know the best time, specifically for your pet, but generally speaking the health benefits are greater pre-puberty. Puberty in your furry friend can set in as early as four months. Desexing more mature animals has to be done if they have not been desexed earlier. Consult with your veterinarian to determine if your pet is in good health prior to the procedure.