It occurs mostly at the beginning of spring or the fall. Female dogs go through a heat cycle, which is similar to a period in a human, every 6 to 9 months or so. The dog heat cycle can vary dramatically. In some large dog breeds, the first heat might not appear until they are 2 years old. Most dogs come into heat twice per year, or about every six months, although the interval can vary between breeds and from dog to dog. A dog's heat cycle, also known as the estrus cycle, occurs for most dogs twice per year. When a dog reaches puberty, that's when she begins her estrus (or heat) cycle. Males generally will not be interested in mating with a dog which is not in heat. Dogs in heat go through various cycles, which can vary in length. The heat cycle is also known as the estrus cycle. Dogs go into heat on average twice a year, but some dogs may go into heat three times and many larger breeds only once annually. A dog's heat cycle generally occurs twice a year, from January to March and August to October. It can last from 60-90 days and the dog is no longer fertile. Smaller breeds also might have more than two cycles a … The heat period will occur approximately every 6 months or twice a year. The cycle lasts an average of 12 to 21 days but can be as short as a few days or last as long as four weeks. If the dog gets pregnant during her heat cycle, this stage lasts until the birth of the puppies, which is around 60 days. The time it takes for a dog’s first heat cycle can vary greatly depending on their size and even their breed, and while there’s generally nothing to worry about, there are times when a trip to the vet might be in order. Most female dogs will have have their first periods irregularly, but the cycle tends to normalize in the first two years. It can take up to two years for a female dog to develop regular cycles. Larger dogs may cycle only once per year. Normally, female dogs are in heat twice a year, for a period of two to three weeks. The same applies to the regularity of the female dog period. Dogs that aren't spayed go into heat about every six months. Keep in mind that this period differs from dog to dog, and can depend on age or food. When young dogs first begin to cycle, it is normal for their cycles to be somewhat irregular. Many times the onset of puberty, and the length of the estrus cycle depends on the breed and size of the dog. During a heat cycle, a female dog that has not been spayed will … Younger and older dogs tend to have a more irregular heat cycle, and often the size of your dog can affect how often they go into heat. Just as small dogs come into heat earlier, they also cycle more often, and may go into heat three times per year. Small breed dogs may cycle three times per year, while giant breed dogs may only cycle once every 12 months. 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