A dog's lifespan varies based on factors such as breed, size, genetics, living environment and medical care. Generally speaking, small dogs have a relatively long lifespan, while large dogs have a relatively short lifespan. Here are some common situations:

Small dogs: usually live 15-18 years Years or so.

Medium-sized dogs: Lifespan is approximately 12-15 years.

Large dogs: generally 10-12 years.