A dog's three-year-old age is equivalent to about 28 years old in humans, which is a period of adolescence. During this period, dogs are more lively and naughty, like to play, are more sensible and understanding of human nature, and can learn some relatively simple commands. Dogs at the age of three have already It has the ability to reproduce and can be bred when it reaches the estrus period.
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The average lifespan of a dog is about 15 years, and the lifespan of small dogs will be longer than that of large dogs.