@outdoorpuplover Thanks, that's a very nice, thorough site!  Sadly our pup is 50 lbs, so these won't work this time around.  Our dog's getting really old and we find ourselves taking half days when backpacking with her because she gets tired.  We already had one instance this summer where I ran 7 miles to get the car to keep her from having to walk too far!  Last year we found out that she most likely had anaplasmosis.  She was really sick for a few weeks and it made us wonder how best to get her down a mountain if we had too!  She still loves to get out there, but not as much after a day or too on the rough trails.