When can you breed a dog?

Answer 1

At home, no - this would be illegal and you would risk killing your dog. If your female dog has recently come out of heat and was bred by a male dog, your veterinarian can administer a "mis-mating" shot (basically high-dose progesterone, or Birth Control) that should keep her from carrying any puppies. However, if your female is already confirmed pregnant, the most a veterinarian can do is spay your female, during which the fetal puppies are terminated. If you absolutely need a single litter aborted, but the female left intact, you will need to contact a veterinary theriogenologist for assistance - this is going to be an expensive and risky surgery.

Answer 2

This should not be done. This may be considered an act of cruelty. If the puppies are unwanted, you can take the dog to the vet and ask them about their abort policy.

Answer 3

when there ready