I might become one soon too. Toto is getting older and I end up carrying him. If i do the two mile walk I end up carrying him for 1 3/4 miles. At least I get an anaerobic bicep workout!
I just don't think the prices they charge are fair. Too much. So for now I won't get one.
__________________  The T.U.B. Pack! Toto, Uni, & Bindi
RIP Lord Scrappington Montgomery McLimpybottom aka El Lenguo the Handicapped Ninja 10-12-12 
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