Thank you for the kind responses, I raised this question at another forum and the response from some posters was decidly negative, do you realise the amount of exercise a chi needs, could you cope with housebreaking etc etc. So much so it has put me off the idea, one poster even stated no dog is going to be happy being carried and running around a stationary wheelchair, no wonder the JRT was the way it was. I replied to this that I was never stationary, the JRT would never listen or stop running around, no matter hoe I tried and I would only carry the dog across busy roads and walk it on cycle tracks or forest roads or even the 3/4 quiet residenal streets between my home and nearest bus stop and would stop for the dog to do its business or sniff whilst on the leash.
Im not saying that all the advice was this bad, most of the advice was very helpful but I did get the impression they were mini Linford Christies on the go all the time, one poster even said after 5 mile walks, her chi were still on the go and complete bonkers, not suitable at all in my situation. But I can see that perhaps this is not the case and thank you Susan Davis and Ari1405 for the advice, I had read that chi could be litter boxed trained which could be handy as I know they are not found of the cold or the rain.
Rockiesmam01 thats what I was thinking they would be a managable breed for me and when accidents occur easy enough to clean up.
I don't think I have any (or meet the) requirement(s) for or need for assistance dogs, as I live completely independently even if I do things from a kneeling or sitting position, and the dog would simply be a companion.
As I say, the other forum posters have put me off the idea for now but thank you all for showing me its at least possible in the future.