Sealyham Terrier
Source: Spruce Pets
Like many other dog breeds, the Sealyham terrier was originally bred to hunt small animals and other game. Therefore, the breed generally features an independent and strong-willed personalities, which in-turn makes it hard to train them. They also tend to be aloof, and uncomfortable with other strangers and humans alike, making them come off as somewhat “untrained and dumb” to the untrained eye.