Generally, the BT should get along with other dogs. If you are making a Border your second dog, it is best to get the opposite sex to the dog you currently own. This will help avoid possible fighting which occurs more frequently between dogs of the same sex. In the case of cats, if introduced at a young age, they can live together harmoniously, but never trust them with outside cats or neighborhood cats that wander into your yard. A BT will view gerbils, guinea pigs, hamsters, rabbits, birds and other small, caged pets, as vermin to be hunted. Therefore, they really cannot be trusted around such creatures. Make certain that any critter's cages are well out of the reach of a BT. After all, a BT was bred to hunt, making it important to recognize and accept this characteristic if you wish to acquire a BT.