Dogs can smell and hear very well, but cannot see well in color, or they are color blind. Dogs have four legs and make a "bark," "woof," or "arf" sound. Dogs often chase cats, and most dogs will fetch a ball or stick.
Dogs usually live about 10 years or more. The size and the breed of the dog may change how long the dog lives. Smaller dog breeds usually live longer.[2]
Like wolves, wild dogs travel in groups called packs. Packs of dogs are ordered by rank, and dogs with low rank will submit to other dogs with higher rank. The highest ranked dog is called the alpha male. A dog in a group helps and cares for others. Domesticated dogs often view their owner as the alpha male.[source?]