My husband made my dog (doxie/aussie mix) this cart this past winter. He gets around in it just fine but there always seems to be some sort of design issue to me when I look at it but I can't quite put my finger on it. I'm thinking the side pieces need to be extended forward further to his shoulder and the padded area needs to be moved forward so it's directly over his shoulder (more toward where his collar would be). I also think it's needs a larger support pad that goes further up onto his chest to give him more support since he's got a longer back.
Here are a couple of pictures of him in it so you guys can see what I mean. Any design change advice is very welcome, this is the first cart he's made for Jake so it's kind of a rough model.
It does have holders for his feet but they were getting re-worked this afternoon so they're not on the cart in these pictures.
Let me know if you need different pictures to get a better idea of how it looks. Thanks for any and all input!