These wonderful pets have earned this nickname because they take up such little space and enjoy being physically close to their human companions. Pocket pets are particularly good companions for those who live in smaller houses or apartments. That's not to say they need less time and attention than larger animals. Contrary to their oft-maligned reputation, domestic rats can be extremely intelligent and affectionate and become quite attached to their owners, many of whom compare them to small dogs. Most trained rats enjoy running up an arm and gazing at the world from a shoulder perch, and it is also their method of a friendly greeting.
Male rats tend to laze about and cuddle up, while females are more active.
During the day, rats need at least an hour of play time, and well-socialized rats enjoy games such as wrestling, hide and seek and tug of war. Determining the correct sex of a rat or mouse can be a little difficult for a novice, but veterinarians and knowledgeable breeders will be able to distinguish between males and females. Rats are generally fully weaned at five weeks and may be ready for a new home at about six weeks. Rats taken from their families any earlier tend to be unsocialized. It is a good idea to avoid retailers who sell very young rats or mice, as it can be an indication that they have not been handled often by a human, which is necessary for forming an animal-human bond.