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  2. 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.

  3. 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.

  4. Dog behavior - Wikipedia

    en.wikipedia.org/wiki/Dog_behavior

    Dogs reach sexual maturity and can reproduce during their first year, in contrast to wolves at two years-of-age. Female dogs have their first estrus ("heat") at 6 to 12 months-of-age; smaller dogs tend to come into heat earlier whereas larger dogs take longer to mature.

  5. 21 Dog Breeds That Can Handle Hot Weather (and 6 That ... - AOL

    www.aol.com/21-dog-breeds-handle-hot-160000402.html

    These dogs can withstand high heat without tiring and need—or rather, love—tons of exercise. In fact, an Australian kelpie named Abbie is the top surfing dog in the world because that is a ...

  6. Here are signs of heat exhaustion in dogs & tips to best ...

    www.aol.com/signs-heat-exhaustion-dogs-tips...

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  7. Domestication of the dog - Wikipedia

    en.wikipedia.org/wiki/Domestication_of_the_dog

    The domestication of the dog was the process which led to the domestic dog. This included the dog's genetic divergence from the wolf, its domestication, and the emergence of the first dogs. Genetic studies suggest that all ancient and modern dogs share a common ancestry and descended from an ancient, now-extinct wolf population – or closely ...

  8. Dogs experience heat exhaustion when their body temperature hits 103 degrees, according to pet food company Hill’s Pet Nutrition. It’s typically safe to leave your dog in the car for no more ...

  9. Dog - Wikipedia

    en.wikipedia.org/wiki/Dog

    The dog was the first species to be domesticated by humans, over 14,000 years ago and before the development of agriculture. Experts estimate that due to their long ...