Popware for Pets Travel Cups (Large - Pink) can latch onto your dog's leash when you are on the go. Collapses to less than 0.5in in thickness. Can be clipped to leashes, backpacks, belt-loops, and even pet collars. Great for traveling, camping, walks, and pet sport events. Washes collapsed. Dishwasher safe.
folds flat - a little small by JC from San Antonio12/06/2011
This bowl is about 6" in diameter and holds 8 oz of liquid. I plan on taking this on our next long hike. It folds flat and has a hook to attach to your belt or backpack. This would work for a medium or large dog but not an extra large dog with a big snout.