Anybody know where I can get a doggy sling?

My dad is bringing his Jack (25lbs) hiking in NS and they need a doggy pack to be able to carry him if he gets too tired (like a baby carrier). They leave on friday... Anybody know a good one, and maybe who might have it in stock?
I'm thinking like the "Petaroo" or the "Sling-go" from Outward Hound. http://www.petstep.ca/outward.htm
Do you all know any other companies?

Animalerie and Pawtisserie on Sherbrooke in Westmount may have that in stock. They have odd things normally. If you need their info let me know.

The outward hound front carriers and slings are a 20 pound maximum. While it might be okay for a 25 pound dog, they may not fit well in all of them... It's one of those things I'd want to be able to 'try on'.

They sell them at petsmart online but not in the actual store. I found both at superpet.. and when my cocker was only 15 pounds she was too big/ long for both.

I thought the sling was beyond cool though, and am still sad.. I wanted one. :(