However, Steve Leshem, DVM, and other veterinarians caution dog lovers that age, health issues, and climate can impact their dogs’ exercise programs. Older dogs weary easily and cannot handle long periods of strenuous exercise. Their owners should watch for signs of fatigue, including lagging behind, panting, and limping. If your dogs become exhausted, cut the exercise session short in order to give them time to recuperate. Puppies also need special care. Overly strenuous exercise can damage their skeletons. Pet lovers should consult the vet about age-related limitations. Dogs with severe orthopedic issues may need to swim rather than walk to lose weight. Finally, different breeds have different levels of tolerance for heat and cold. Pet owners should make sure that their pets are properly prepared for the local climate before they set out on a walk.