Dogs should be the first choice for many people, because they are the most common and lovely. Dogs are good friends of human beings. They are gentle and loyal, especially when girls are alone. Keeping a dog with them can also bring a sense of security. Moreover, as long as the dog is educated well from an early age, there is no need to worry about the hygiene of the dog at all, and the average cost of raising a puppy is not very high. Girls are still suitable.