3. Jack Russell Terrier
The Jack Russell Terrier is known for being one of the most energetic dog breeds out there, and that’s because they were originally bred to hunt foxes. They’re used to running long distances and following foxes down into the holes. For this reason, you cannot be a couch potato with this breed. They require constant stimulation, both physical and mental, in order to be happy. Their size makes them perfect for apartment living, but you have to work to provide them with exercise every day. They’re friendly to children and strangers alike but have a high prey drive, so you should not put them outside unattended.