Will desexing calm my dog?
A dog's temperament, training, personality, and ability to do "work" are a result of genetics and upbringing, not its male hormones.
Castration does not "calm" an excitable dog, and unless a castrated male dog is overfed or underexercised, there is no reason for it to become fat and lazy.
Age. As a general rule, dogs mature to full-size around 12 to 18 months, with some large breeds taking up to two years.
When a dog matures does factor into when the dog begins to calm down - but dogs of many breeds don't calm down when they become adults.
Long-term behavior changes are usually positive if the spay or neuter was performed at a young age.
For example, male dogs may become less aggressive.
This means that some dogs will "calm down" over the next few months, while others may take years to calm down.
Dogs that are neutered will still usually lift their leg when they go, but it reduces their marking behavior, and in some cases even eliminates it.
The instinct of aggression is also related to male hormones, so when a dog is neutered that trigger is removed.
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