I have a shih tzu, that is 5 years old, that is having trouble walking on he back legs, she drags them around on the floor, then there are at time she will run and play and use her back legs. The vet said I could get a wheelchair for her, but they cost so much. Has anyone got a use one or know where I can get one cheap. My husband and I are on disbility and she is the love of our life, so we need to help her asap. Thanks connie

Maybe look on the clasifieds or something like kijiji. My neighbour made one, and I think her husband googles dogy wheelchair, and found all the supplies at second hand stores. It wasn't the prettiest, but it did the job.

Here's the website for handicapped pets.
The link below will take you straight to the page on making doggy wheel chairs yourself, it even has blueprints on there :)

DIY Dog Wheels