Why small dogs live longer than large dogs What causes longer life span

The large number of cells dividing requires more energy to be expended after the puppy is born, and over the course of adulthood, the weight of a small dog like a Poodle roughly doubles 20 times, and for a dog like a Great Dane it doubles more than 100 times. Such a large span of growth requires rapid cell division and growth, which means their bodies need to exert more effort to grow more flesh and get more energy to produce more cells, and this process will accelerate their aging. And this is likely to bring them many side effects, such as developmental disorders, skeletal, muscular and digestive tract problems. The smaller the body size, the less stress on the bones. In addition, in terms of the dog’s body structure, a larger body size means a greater burden on the internal organs, which require more energy to keep the body working, and a greater stress on the bones. This is why medium and large dogs have a very high chance of developing arthritis.
Small dogs develop more slowly than large dogs. We should know that large dogs grow quickly, reaching maturity in all aspects of their bodies at about 18 months, while small dogs do not mature until 24 months. The fast growth rate also indicates the overall speed of the life process, which means that they age earlier than small dogs of the same age. Therefore, in the care process, we usually start feeding senior food when large dogs are 6 years old, while small dogs start eating it around 8 years old.
To ensure that your dog needs regular medical checkups

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