We have a male 5 pound toy poodle who is very mellow with the nicest temperament of any dog we've ever owned. He's just over a year old now, and the vet has asked when we would like to neuter him. I haven't set an appointment for the surgery because my family is conflicted as to whether or not we should have it done (my teenage boys say "NOOOOO" of course, lol). We don't want his personality to change at all and actually wouldn't want him to be any more calm or mellow than he already is. The data I'm reading online on the health benefits of neutering are conflicting. Did your dog's personality change after being neutered? Any other changes to your dog after neutering that you regret? Positives? Any strong feelings either way on to neuter or not to neuter?