Background
Dogs (Canis lupus familiaris) are sociable pets known for their loyalty and companionship. Their natural instincts as pack animals often lead to owners viewing their dogs as part of the family and many breeds make ideal child-friendly pets.
Appearance

Dogs differ in size and appearance from the smallest breed being a Chihuahua to the largest breed being a Great Dane. Some breeds of dogs have long coats, whilst others, such as the Chinese Crested are hairless.
Behaviour
Dogs are very sociable pets, but their personality and behaviour often differs from breed to breed. It’s advisable to do your research when you’re thinking about buying a dog.
Lifespan
The lifespan of dogs depends on the breed; large breeds can live for approximately 5 years, while small breeds can life for up to 15 years.