I'm a 'dog person' rather than a 'cat person' so of course I'd recommend a dog. And I don't see how a cat would fit the medical requirements. Still miss my old dog tho it's been 5 years since he 'moved on'. I'd agree with Wyrd Sister and Sooz 100% . Is there a dog home/rescue centre somewhere near you where you could help out for a while. It would get you the exercise and give you an idea of how dog/person relations work. And you might find your (canine) soul mate ...

sian