Dutchess, thank you so much for your informative response. And, I agree with your decision about not putting Gizmo through extensive tests or surgery. I have made the same decision. I will look into the carts - and thank you for the advice.
I am so glad that Gizmo is doing well, in spite of his restrictions.
Oh! I just love Caesear, the Dog Whisperer. Isn’t he wonderful?