The new PetZip Pet Happy Trailer can be easily attached to a bicycle or used as a stroller. This large pet stroller can accommodate dogs up to 75 lbs with Front and rear entry zip open for quick, easy access. The Pet Happy Trailer includes a wind and rain cover so that you and your pup are ready for whatever the day may bring! The Three-wheel design provides easy mobility and maximum stability. When not in use it is very easy to fold for storage.