Neutering can reduce dominant, territorial, and inter-dog aggression in male dogs.
Neutered males are less likely to roam from home looking for mates. This reduces risks of getting lost.
With lower testosterone after neuter, male dogs may be more focused and attentive when training.
You may notice more mellow, relaxed behavior in dogs after neutering.
Spaying female dogs reduces estrogen, which curbs mating urges and nervous energy.
Neutering eliminates testicular and ovarian cancer risk and reduces mammary tumors.
Dogs' core personalities stay the same after neutering. It reduces intensity of urges.