EMT Gel for cuts, tears -works as advertised.
Nylon stocking to hold sterile pads in place over ears, feet, etc.
Leatherman tool for porcupine quills.
Karo syrup for a pick me up if hypoglacemic.
Cell phone w/ preprogrammed # for vet.
Water the "two bottle rule" one for on the way out, save the other one for the way back.
Don't drink the dog's water bring your own supply for yourself.