Example of Small Dogs : 1 - 10lbs :  Chihuahuas , Yorkies , Pomeranians , Papillions , Maltese

Examples of Small Dogs : 11 - 25 lbs :  Boston Terrier , Dachshunds, Pekingese , Pugs , Mini Poodles , Shih Tzu , West Highland Terriers

Examples of Medium Size Dogs : 26 - 40 lbs :  Beagles , Cairn Terriers , Cavalier King Charles , Shetland Sheep Dogs , Scottish Terriers ,

Examples of Large Dogs : 41 - 70 lbs :  Australian Shephard , Bassett Hounds , Boxers , Bull Dogs , Bull Terriers , Cocker Spaniels , English Springer Spaniel , Shar pei

Examples of Xtra Large Dogs : 71 x 90 lbs :  Border Collies , Chow Chows , Dobermans , German Shephards , Golden and Labrador Retrievers , Rottweilers , Rhodesian Ridgebacks , Weimaraners

Examples of XXtra Large Size Dogs : 91 - 110 lbs :  Alaskan Malamute , Bernese Mountain Dogs , Great Danes , Old English Sheep Dogs , Saint Bernard , Weimaraners