I am very sorry to hear that. Each case is different. I will not try to guess how he may do. I am glad you are looking into carts. I have seen several positive reports on them. Don't know if you need them, but here are a couple of links others have said they used,
http://WWW.K9carts.com and
http://www.eddieswheels.com I have a hoard of credible links.
Do a search here and you may even find who originally posted them and share experience. It may have been over 6 months ago.
OK, I right clicked on edit and selected open in a new window.
I tried to add the title testing.