By Ruthie Bently
Not every dog is capable of creating progeny to leave behind. Either the male or female can be sterile. What causes a dog to be sterile or to become sterile? Canine sterility can be caused by a myriad of things. Some causes of canine infertility can happen to either sex, and some are gender specific.
A female dog comes into heat twice a year for approximately three weeks. A first heat can occur between the age of six weeks and fifteen months, depending on the dog’s breed. Normal heat cycles occur at six month intervals, but can occur from five to eight months apart. If there is more than one female dog in a household, one is dominant and their heat cycle can control the cycles of the other females in the household. Many professionals suggest waiting until a female is over two or has had several heats, as she may not be able to carry the puppies to term. A male dog doesn’t come into “season” like a female, but if he is sexually mature he is capable of fathering puppies.