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1. A bitch ought to have at least one litter, or at least one heat, before being spayed.

The chances of mammary cancer in bitches gets much lower when they are spayed before their first heat.  Spaying a female before breeding her eliminates the chances of medical problems during a pregnancy or during birth or while rearing puppies. Also, puppies sterilized when they are young actually have FEWER problems with the surgery than dogs who are neutered later (Faggella 1994, Howe 1997).

Before you let your dog "have just one litter", spend some time volunteering at your local shelter and see all the puppies and dogs who must be killed daily. Letting your dogs breed only adds to the death toll, and to the vast numbers of dogs already suffering from genetic diseases like hip dysplasia, von Willebrand's disease, progressive retinal atrophy, and many other diseases which can only be avoided by careful planning BEFORE breeding.

2. Castrating male dogs makes them more likely to get prostate cancer.

No, this is not true. There is apparently NO significant difference between the incidence of prostatic adenocarcinoma in intact males vs castrated males (Obradovich 1987). The only difference is an increased spread of the cancer to the lungs of the neutered dogs (Bell 1991). And MOST types of prostatic disease are ELIMINATED by castration, as discussed above (Krawiec 1994).

3. Dogs won't be happy after they're altered.

Dogs are not like humans. They don't look forward to having children, they don't expect to raise children and worry over them for 18 years or so, they don't dream of being grandparents some day. Male dogs don't even realize that pups they produce are their own offspring. A dog's reproductive urges are based solely on its hormones. Once the hormones are removed, the urges go away and the dog doesn't miss them.

4. A bitch will become aggressive after being spayed.

This is rarely true.  A bitch which is ALREADY aggressive may become more aggressive after being spayed. But the vast majority of dogs -- those who are NOT already aggressive -- will not become aggressive simply because they have been altered.

5. Dogs who are sterilized when young will be less stable and tend to have more behavioural problems than dogs who are left intact.

There is no substantial evidence to support this myth. Dogs who are altered early in life may sometimes be more active than their intact counterparts, but it appears that there is no other significant behavioural difference between dogs neutered neutered later (7 months) (Salmeri 1991a). However, it has been well known for many years that altering dogs actually helps to decrease several significant behavioural problems.

Also, consider this: Service dogs, such as seeing-eye dogs, are almost always altered before being put into service. Many dogs participating in advanced obedience competitions are also sterilized. Obviously, dogs must be very mature and stable in order to fill these jobs, and the surgery is performed because it actually INCREASES their stability by removing the distractions of the sexual cycles.

6. Behaviour problems can be prevented by good training and socialization, so sterilization isn't necessary.

Good training and socialization are definitely essential to having a healthy happy companion. However, even the best-trained dogs in the world can have behaviour problems. Remember, the sex hormones act on behaviour at a very fundamental level, so those effects may override even the best training. Because of the effects of sex hormones, especially testosterone, intact male dogs are at the highest risk of any dogs for developing aggression problems (Beaver 1983, Blackshaw 1991, Galac 1997, Line 1986, etc ).

7. If I castrate my male dog he won't protect me any more.

Castrated dogs may actually be more protective, because they will no longer be distracted by the temptations of breeding. Instead of roaming after dogs in heat, or fighting with other males, he will be paying attention to you and you alone. In fact, one recent study has found that castration has NO effect on aggression towards unfamiliar people (Neilson 1997).

8. Only the dominant wolves in a pack get to mate, so intact dogs in a household won't be frustrated if they don't get to mate.

What do adolescent wolves do? They either leave the pack, start a pack of their own, challenge the dominant pack members for dominance, or help the parents to raise their future siblings. Do we want our pets to leave or to challenge us? Are we going to breed more puppies just so our intact dogs can have relatives to help raise? No. We want our pet dogs to enjoy living with us, not try to establish dominance over us.

Also, remember that our domestic dogs ARE NOT WOLVES. They act very differently than wolves do in many important ways, so we can't count on wolves to tell us how our dogs will behave.

9. My dog would make really great puppies/I want to have another dog just like my dog, so I'm going to breed him/her.

Roughly 25-30% of all dogs in shelters are purebreds. Even if your dog is ANKC registered, that doesn't mean that the dog should be bred. Before ANY dog is bred the owner should prove that the dog will actually improve the breed. Thorough health testing, including tests for genetic diseases, should also be performed.

Also, your dog is a unique individual. There is no guarantee that puppies will resemble their parents in looks or personality, especially if the parents are mixed breed dogs.

10. Breeding dogs is a good way to make money.

The only people who make any money from breeding dogs are those who don't care about the health of their dogs or the quality of the puppies they produce. Responsible breeding requires health testing and medical care, as well as careful consideration of the pedigrees of the parents, their temperament, and whether their puppies would actually improve their breed or merely be more fodder for the shelters.

Medical costs before breeding will include extensive health testing, which may include x-rays, blood work, tests for infectious diseases like brucellosis, tests for genetic diseases like von Willebrands, ultrasound exams to check for heart problems, CERF and BAER exams to check for eye and ear problems, and other additional tests depending on the breed of the dog. Medical costs after breeding will include pregnancy tests, ultrasound to check the progress of puppies, perhaps caesarean section if the dog has trouble giving birth, vaccinations, worming, tail docking and ear cropping in cropped or docked breeds, and veterinary care if the puppies should become ill. And that doesn't even consider stud fees, registration fees, travel costs to get to a stud, expenses to show your dog and prove that it's worthy of breeding, or the time you must invest in the mating, pregnancy care, whelping, feeding and cleaning the puppies, visits to the veterinary hospital, or advertising and selling the puppies.

11. My children should see the miracle of birth.

First, dogs usually give birth in the middle of the night when the children aren't going to be around, and dogs prefer to have quiet and privacy during birth. If the mother dog is disturbed by children or too many other witnesses, she may become stressed and abandon the puppies or even kill them. And, of course, there are already too many puppies dying in shelters every day.

Second, if you want your children to learn responsibility through caring for a puppy, there are many great puppies waiting for adoption at your local shelter. If you want to see the miracle of birth, you should first witness the miracle of death by volunteering at your local shelter for a few weeks. And there's a better alternative: if you want to witness the miracle of birth, rent a video.

12. We can find good homes for the puppies.

For every puppy you breed and place in a new home, a puppy or dog in a shelter may die because it wasn't adopted. There simply aren't enough homes for them all. And even if we ignore the puppies in the shelters -- are you SURE your puppies are going to good homes? Are you following them in their new homes throughout their lives? Are you willing to take the puppies back if their new homes don't work out? If you produce a puppy, you are responsible for it throughout its entire life.

13. We should leave our dogs as Nature intended them.

There is nothing "natural" about today's domesticated dogs. They have been created by many generations of human breeding. We have brought pet dogs into our homes, and we are responsible for their well-being. Dogs benefit in many ways from being sterilized, and suffer few serious consequences.

Acknowledgement: Ione L. Smith, DVM