The dog is a domesticated subspecies of the Gray Wolf. The domestic dog has been one of the most widely kept working and companion animals in human history.

The domestication of the gray wolf took place roughly 15,000 years ago. Dogs perform many roles for people, such as hunting, herding, protection, and, more recently, assisting handicapped individuals.

Dogs I (Affenpinscher - American Mastiff (Panja))

Dogs II (American Staffordshire Terrier - Bichon-Yorkie)

Dogs III  (Black and Tan Coonhound - Cavalier King Charles Spaniel)

Dogs IV (Chesapeake Bay Retriever - English Springer Spaniel)

Dogs V (English Toy Spaniel - Harrier)

Dogs VI (Havanese - Mastiff)

Dogs VII (Miniature Bull Terrier - Pit Bull Terrier)

Dogs VIII  (Plott - Shiba Inu)

Dogs IX (Shih Tzu - Yorkshire Terrier)

Dogs X (Misc Dog picturers)