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My girlfriend's fatty lab is getting to fucking fat. So I'm taking him on the trail with me. I bought a clearanced backpack for him, to get him used to carrying a load. I'll start light (two bottles of water for him to drink, and a collapsible bowl) but I don't know what else for him to carry.
I have my own day pack, with rain shell, first aid kit, my water, trail snacks, and a bit of room for my jacket if I take it, or take it off.
What else should a dog carry?