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Of course you can use this picture! There are lots of different pipes with different wall thickness, maybe you will find some that will be able to support such a weight.
Hi there! 42 kg is a lot but I think that you could try to build a wheelchair using pvc pipes (it should do the job). They are cheap, durable and there is a great choice of different connectors on the market (I used 90-degree and 45-degree elbows to create the prototype; I loaded it with 30kg weight and there was no problem). With the use of glue, drill and saw you can make a nice working wheelchair. There are also some good tutorials in the internet connected with pvc wheelchairs.
Thank you! Unfortunately I have only photos but I hope I'll be able to get some footage of the dog in a wheelchair in about two weeks. Agnes is too weak to run - she needs a long rehabilitation (she's almost completely paralyzed) but I hope she'll be able to walk in the future.
Dog wheelchair (quad)View Instructable »