The term "toy dog" refers to a small breed of dogs that are typically kept as pets and companion animals. These dogs are generally very small in size, with an average weight ranging from 1-20 pounds (0.45-9 kg), and have been bred for their diminutive stature rather than for any specific working function. Toy dog breeds include popular choices such as the Chihuahua, Pomeranian, Yorkshire Terrier, Maltese, and many others. These dogs are known for their affectionate nature, adaptability to small living spaces, and ease of care, making them a popular choice among pet owners.