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We can only imagine to use it for sick dogs … if the owner still wants to go for a walk 
One handicapped woman found it extemely useful to be able to walk without walker
Whether you are going on a short walk around the block or a long walk through the park, the Pet GearTM Happy Trails Pet Stroller gives you the freedom to take your family pet anywhere you go.
Flat, compact fold - stores flat for storage or travel.
Large storage basket - for toys,treats,water bottle,and more.
Large 8″ wheels - for use on smooth and rough terrain.
Easy to operate brake mechanism on back wheels.
Durable, breathable mesh - provides airflow and visibility.
One hand fold mechanism - easily folds in less than 5 seconds.
Parent tray - holds keys, cell phone, beverage, etc.
Front and back entries - zip open for quick, easy access.
600 Denier nylon fabric - tough and water resistant.
Padded handlebar.
Measures 14″W x 24″D x 39″H–for pets up to 30 lbs.
Stroller is ideal for puppies, kittens, small dogs, small animals, and older pets, too.