At what age to neuter puppy?

I've worked in at a vet clinic 4 years and at an animal shelter for 20 years. Been a full time "dog nut", since I was 14 and am now 51. I'm pretty up on all the various controversies concerning companion animals, since I am writing a book on it (I've authored 3 already).

There IS controversy about early age altering.

As a shelter worker, I push for early age altering (8 weeks and older) as I know that: a) the animal will only be a "pet" and never a serious working/sport animal. b) while scads of great people come to shelters to adopt, so do double scads of impulse buyers and those looking for cheap dogs with which to create those expensive "designer breeds". I would MUCH rather get the altering done with rescue and shelter dogs, and any physical issues will be of minimal consequence to a dog who is going to lead a pretty soft life activity wise.

As a working/sport dog freak, I absolutely WILL NOT alter my male dogs before 12 months of age. I have not found there to be a significant issue with the grump, and will spay as early as 8 months on them.
There is plenty of good info to be googled on the structural issues caused to male dogs by early altering. As well, I can EASILY pick out an "early age neuter" animal of my breed on sight. They look like labs in body type.

My recommendation is this: if you are the type who will "have an oops" experience because you didn't realize your grump was in heat (often difficult with coated breeds and on all breeds with first heats) then by all means get it done around 6 months of age.

If you are going to use your dog for any work/sport that requires real activity then wait on the males.

As well, I can tell you that the "myth" of behavior changes with altering is just that. Altering a male reduces SEX drive. It does not reduce HUNTING/PREY drive, DEFENSE drive, etc. It just takes away the crazyness when a female is in heat, making it kinder for dogs which are not going to be allowed to mate. IT DOES NOT STOP FIGHTING. It does not stop leg lifting in many cases - unless done young. It DOES REDUCE WANDERING - but ONLY with dogs that wandered due to looking for grump in heat. ALL dogs wander if not fenced, so altering a pup will NOT KEEP IT OUT OF THE ROAD!

Adult dogs which are altered can and will still mate with in heat females, they just won't be as avid about it.

Is a neutered dog much different from an unaltered dog? Yes and no. It depends on age. If you wait until your dog is mature, say altering after 16 months, your dog will change very, very little when altered. He may become a slightly better working or sport dog, with his mind on you more.

However, I have found that there are a number of woman (many who work in the animal welfare world) that are honest to gawd she-woman man-haters. They seem to hate ALL THINGS MALE. I had a friend like this in pit bull rescue once, who now, sadly, works for the organization, and she couldn't stand to even HEAR the word penis, or testicle, or anything. It seemed her mission in life was to round up every male animal on earth and take away its maleness. These folks are often in control of policy making, and explains the current hysteria over altering. Lord knows, no one knows there are too many unwanted dogs on this planet as much as I DO! I had to hold them in my arms and euthanise them (up to 10 a day) for 20 years. But I also believe that altering is a PERSONAL choice for the pet owner, and that those who keep whole animals, when they are not negatively impacting the community, should not be penalized by outrageous license fees, etc.

So there you go! Pups are cute.
 
they suggest 6 months. we got ours done at four because he was showing early signs of aggression and it helped 80%. I know alot of people think it is a myth that this works but it worked for us.

if your pups are fine, id say 6 months...
 
Speaking as a vet. I have done 8 weeks and 6 mos and 12 years.

I like to neuter male dogs before they learn to mark. Once that part of their psyche gets going it's hard to reverse. 6 months is fine in a mid size dog.

To get a good estimate of size for an adult dog, you can double their wt. at 4 months. If they are pound puppies, they will start losing their front incisors at 16-18 weeks. This is average. Toy breeds are a different story.
 
A forum with a large number of nonUS members once provided me with a ton of info and studies about early spay/neuter increasing the odds of aggressive behavior especially in females, it's actually the policy of some service dog groups now not to neuter before 8months because of those studies, and causing some health issues with performance/working dogs. Most of the agility group would also not neuter before 8, 10, or sometimes 12 months. I decided since I could keep my dog completely confined and she was not of a breed that was allowed off leashed in unfenced areas anyway that it was best for her health to reach 10months or 1 heat cycle before spaying. However if there is any question of your ability to keep track of your dog or if this is a mostly outside dog not contained in a very secure kennel I would definitely support neutering earlier and I have nothing against shelters doing early neuters so they can adopt them out already altered animals. I just found the information compelling enough to wait since I had that luxury and I would do it again with my next dog. Actually for my next dog I plan to have a house by then, build fort knox all the way around the property to protect all the animals, a secondary fenced area inside that attached to the house for the dogs, and never neuter. Just a personal preference after tons of research into all sides of things.
 
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I compete in conformation, obedience and hunting. I also work as a vet tech at a shelter in their low/no cost spay and neuter clinic. I've followed several studies on Golden Retrievers that have shown that early spay and neuter can increase risks of orthopedic problems. aggression and certain cancers. Spay and neuter after maturity, or leaving intact, increases risks of other cancers, sexual behaviors (like marking) and pyometria becomes a serious risk for females. My personal feelings on the matter is that if the dog is a pet, and accidental pregnancies are a serious risk, then 6 months is ideal. If the dog is expected to work, and is of breed that is already prone to orthopedic issues, then first heat for females, and after 12 months for males.
 
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My personal preference is to not watch a 10 y/o female die of sepsis from an infected uterus (pyometria) or die of mammary cancer because she was never spayed.
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