How do you Know when your Dog is Really Old?You are probably already aware that our beloved dogs age far more rapidly than we do.  And ultimately the life expectancy of a dog is highly dependent upon the breed and size of the dog in question.

Generally, the larger the breed or size, the shorter the life span, but not necessarily.  However, there was a study showing that a mere 13% of giant breeds lived past the age of 10 years, while smaller breed dogs live well past that.