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  2. Estrous cycle - Wikipedia

    en.wikipedia.org/wiki/Estrous_cycle

    A female dog is usually diestrous (goes into heat typically twice per year), although some breeds typically have one or three cycles per year. The proestrus is relatively long at 5 to 9 days, while the estrus may last 4 to 13 days, with a diestrus of 60 days followed by about 90 to 150 days of anestrus.

  3. Canine reproduction - Wikipedia

    en.wikipedia.org/wiki/Canine_reproduction

    During proestrus and estrus, females may have a clear, blood tinged, or bloody discharge. Dogs during these stages are often informally referred to as being in heat. The length of these cycles varies greatly among breeds and even between individuals of the same breed. Proestrus and estrus can last anywhere from 5 days to 21 days. [5] 3.

  4. Long Haired Dachshund's 'Phantom Pregnancy' Tugs at ... - AOL

    www.aol.com/long-haired-dachshunds-phantom...

    It’s best to wait at least eight to ten weeks after your dog was last in heat before spaying her. Depending on the breed, dogs go into heat 1-3 times per year. Purina explains why Mia may be so ...

  5. A Comprehensive Guide to Navigating Your Dog’s Pregnancy - AOL

    www.aol.com/comprehensive-guide-navigating-dog...

    While “doing the deed” doesn’t take long, the success rate is fairly high: experts estimate that as many as 40% of female dogs will become pregnant after just a single mating session. To put ...

  6. Dog breeding - Wikipedia

    en.wikipedia.org/wiki/Dog_breeding

    Dogs reach puberty between 6 and 24 months old, at which age female dogs will start having an estrous cycle. There are four stages of estrous: proestrus, estrus, diestrus, and anestrus. A dog in estrus, also known as being "in heat", can become pregnant during this 3- to 21-day period. [3]

  7. How long do dogs live? We checked with a vet - AOL

    www.aol.com/long-dogs-live-checked-vet-080000777...

    This collar has a long-lasting formula that protects dogs and puppies from fleas and ticks for up to eight months. It starts working within 24 hours to offer fast relief to your pooch. View Deal

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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  9. Aging in dogs - Wikipedia

    en.wikipedia.org/wiki/Aging_in_dogs

    Older dogs, similar to this 10-year-old Neapolitan Mastiff, often grow grey hairs on their muzzles, and some dogs grow grey hair all over. Not all dogs gain grey hair when aging. Aging in dogs varies from breed to breed, and affects the dog's health and physical ability. As with humans, advanced years often bring changes in a dog's ability to ...