Biking isn't suitable for all dog breeds due to varying physical capacities and health concerns. Smaller breeds and dogs with short noses, such as pugs and bulldogs, may find the intense physical exertion challenging and potentially harmful. Conversely, athletic breeds like border collies or huskies may thrive in activities like bikejoring. Always consider a dog's fitness level, age, and joint health before starting any biking routine. Consulting a vet to assess your dog's suitability for biking activities is advisable to prevent injuries and ensure safety.