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www.askabreeder.com/Dog_Heat_Signs_and_Symptoms

This is the fourth and final stage of the dog heat cycle when your dog is normal. This stage last about 60-90 days, at the end of which, the entire heat cycle starts again. In conclusion, pay attention to your dog. Watch her dog heat signs. Know where she is at all times to prevent unwanted suitors from mating with your dog.

breedingbusiness.com/stages-of-the-dog-heat-cycle

This article has two main sections. The first one goes through the different stages of each bitch heat cycle, while the second section goes through the symptoms and signs to expect when your bitch starts one of her cycles. UPDATE: If you simply wants clear answers to your dog heat cycle questions, check out our dog heat cycle FAQ.

www.dogbreedinginformation.com/.../the-dog-heat-cycle

The reproductive dog heat cycle of the bitch is broken up into 4 phases (Pro-estrus, Estrus, Met-estrus and Di-estrus), day 1 of Pro-estrus being the first day of vaginal bleeding ie the day she visibly comes “on heat”. Stage 1 of the Dog Heat Cycle. Pro-estrus: Eggs develop in follicles on the ovaries and produce estrogen.

www.thesprucepets.com/heat-cycle-for-dogs-3385378

Dogs can get pregnant during their first heat cycle, but this is not advisable as a six-month-old dog is not yet fully grown/mature, and complications for the mother and the puppies are more likely. Ideally, a female dog should have two normal heat cycles before being bred.

breedingbusiness.com/dog-whelping-timeline-from-mating-to-delivery

In this comprehensive article, we explain you each major stage of the canine reproduction, gestation and whelping and when appropriate, we add a picture, chart, video or link so you can learn more on the matter. The dog breeding cycle is mainly composed of the below stages: Heat — period where the female dog is fertile and ready to breed

www.pawdiet.com/library/canine-heat-cycle

The canine heat cycle will affect female dogs that have not been spayed (neutered). The duration and age that female dogs come into Estrus can depend on the breed of dog that you own and on each individual dog (as each dog is different).

www.dogbreedinfo.com/breedingheat.htm

Dog Reproduction (The Heat Cycle) Signs of Heat. The first sign of a female (dam) coming "into season" is often swelling of the vulva. This swelling can occur a week before bleeding, or the day before. Other signs of heat are behavioral changes; your dam may start to hump other dams, or pups or even your leg. She may also begin to lick herself ...

www.akc.org/expert-advice/dog-breeding/how-long-are-dogs-in-heat

From about six months old to through the rest of her life, a female dog will experience estrus, or heat, roughly every six months. This is the period of time when she’s receptive to mating.

vcahospitals.com/know-your-pet/estrus-cycles-in-dogs

Estrous Cycles in Dogs. The estrous cycle in dogs on average happens twice a year once a dog reaches sexual maturity. On average a dog will be in heat for 1½ to 2 weeks but this can be shorter or longer. In many cases, a bloody vaginal discharge is the first sign that a pet owner will notice when their dog comes into heat.

www.vetinfo.com/dencyclopedia/deestrus.html

The average heat cycle for a dog is approximately 3 weeks and since this an an average, some heats are shorter (as little as 7-10 days), others are longer (4 weeks or more). Average times between heat periods is seven months but some dogs can cycle as early as every 4 months, some once a year.