The AKC estimates that only 600 Cesky terriers live in the United States, which is a shame: This handsome, wavy-haired breed is very smart, but more trainable than other terriers. Bred from Scottish and Sealyham terriers by a Czech geneticist, they're fairly laid-back with family, but make good watchdogs. Just make sure they've got a fenced-in yard to keep them running too far afield after anything they think of as prey.
A friendly Hungarian farm dog with courage far exceeding its relatively small size, the exceedingly rare Mudi shines at herding and search-and-rescue missions. Its numbers dwindled drastically during World War II, and despite rehabilitation efforts, the AKC estimates that only a few thousand Mudi remain worldwide. This dog loves to run and jump, making it an excellent flyball and Frisbee companion; a suspicious streak also means a mudi can be a great watchdog.
The Caucasian shepherd was bred to guard livestock and homes in all kinds of weather. Also known as the caucasian ovcharka, this fluffy dog may look like an oversized teddy bear, but it has a hard-to-train, fiercely protective nature that may make it difficult for you to have guests over … ever. It can tip the scales at 170 pounds and needs regular grooming, as well as high-quality food.