Hiking
If your area offers hiking opportunities, you've got one lucky dog. "Most dogs love to go out and visit new smells, see other animals," Snyder tells WebMD, "all while spending time with their owner." Like walking, you'll need to maintain a brisk enough pace to elevate your heart rate. And if you live in an area where ticks carry Lyme disease, make sure you cover up and apply an insect repellent containing DEET -- and have your dog vaccinated. After hiking, inspect your body for ticks and do the same for your dog.
Soccer
If you're a soccer fanatic, why not make your dog a fan, too? Check your pet supply store for soccer-style exercise balls for dogs. These are made of hard plastic and come in different sizes to suit your particular breed. You kick the ball, and your dog tries to pass it back with his nose or paws. You can also use a regular soccer ball made for people -- just be careful about kicking the ball directly at your dog's face or body.
Agility Training
Agility training is another popular goal-oriented sport. Your dog races through an obstacle course with ladders, hurdles and tunnels, while you run alongside offering praise and encouragement. The fast pace provides both of you with an excellent cardiovascular workout, while your dog also develops improved coordination. Participate in organized competitions or look for a park with an agility course you can use on your own time.
Doga
Downward-dog takes on a whole new spin when you bring your dog to yoga class. "Doga" incorporates your pet into Hatha yoga poses. For example, you recline in resting pose with your legs bent over your terrier's torso. Classes are springing up across the country, but this is no fat-burner for Fido. "It should be a very nice experience for the human-animal bond," Snyder says, "but I'm not sure I'd consider it a valid exercise plan for dogs."