have a parlayzed dog in the hind legs, would like to know how to make a dog cart.
There's an ible for that.Dog Wheelchair
Very good. I looked and didn't find anything.
Wow. This site has everything.
Depending on how tall the dog is, you could possibly mount a basket-type thing onto a skateboard. I'm thinking Re-design's PVC idea is probably better, though.
This is not an instructable but from the photo it looks really simple to do. Just size it to fit your dog. Pad it where it needs to be and teach him to use it. Good luck with it.
Here's another site with some good photos. I had no idea they were so expensive. I could see me making one out of pvc pipe.