According to PetMD, the average life span of a mixed breed dog under 90 pounds is 11 years, while larger dogs live for about eight years. For purebred dogs, life expectancy varies by breed.
The type of dog most commonly used in Frisbee-catching competitions is the border collie. While nearly any breed can be trained to catch a flying disc, the best are those bred for herding or chasing prey.
There is only one dog breed that is referred to as barkless, a hunting breed from Africa called the Basenji. Instead of barking, the Basenji makes sounds that approximate whining, yodeling, screeching and howling.