Pet Tips Estrus in Dogs It is usually easy to tell when your pet is in estrus or heat, especially for dogs. Dogs have their first heat cycle from 6 to 10 months of age with the larger dogs tending to cycle later. The first physical changes seen are swelling of the breasts and enlargement of the vulva. Soon to follow is a blood tinged vulvular discharge that lasts about 10 days. The full heat cycle lasts for 3 weeks and it is possible for a dog to get pregnant anytime during the cycle. These heat cycles routinely happen about twice a year. If you know you don’t want puppies and have no desire to deal with a bunch of glarie-eyed male dogs around your house for 3 weeks – do the smart thing and have your dog spayed before 6 months of age.
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