A loyal and affectionate breed of dog, the Sealyham Terrier is an excellent hunter, a good watchdog, and not as aggressive as other Terriers. As the Sealyham Terrier is independent by nature, they can be difficult to train. They should be given obedience training and opportunities to socialize at a very early age or they may engage in excessive barking. These dogs are extremely friendly and companionable with the family and love to be in the company of older children. They remain reserved and aloof in the presence of strangers and other dogs. The Sealyham Terrier can live in an apartment and they are experts in catching mice and rats, and other pests..