Side by side with your four-legged friend! You would like to be active with your dog and do long laps and tours with him, but still not exceed his stress limit and protect his bones and joints. Puppies/young dogs, physically handicapped dogs or four-legged seniors should be given a break in a bicycle trailer on longer tours. That's what he's for taXXi DOG M is the right choice for small to medium-sized dogs! Pets love it!