More of a at home remedy, unless you like lugging along cans while hiking....
If your dog has really loose/runny bowels feeding it canned pumpkin mix (like for pies) seems to do the trick at getting them back to normal. Probably, as an educated guess, was what LED was talking about when he suggested water soluable fibre.
IMHO the sawyer extracter kit is "good", just not overly effective. If you or your wife or dog are out in the styx I'd rather use the pump for the roughly 30% effective venom removal than letting it all stay inside. Not a replacement for getting anti-venom, but if every little bit helps I'll take all I can. At the very least it may have a slight mental calming effect on a human victim and a lower heart rate/staying calm is a good thing.

-Bill Liptak