If you want this to feel like a real present rather than a supply run, the bundle that works is: the bed as the main gift, a pair of collapsible bowls tucked inside the roll, and a lit collar on top. That’s a complete kit at a sensible price, and none of it duplicates gear a camper already owns for themselves — the point is that it’s the dog’s.
Two honest cautions. First, size. Camping beds are cut to roll tight, so they run smaller than they appear; measure the dog stretched out and size up if you’re between. Second, weight. A 77oz water bottle is a genuinely good gift for a whole day on a trail and a silly thing to carry round the block, so buy it for the person who does long days, not the one who does short ones.
What not to buy: dog boots, unless you know they already use them. They need fitting and most dogs need weeks of getting used to them, so as a surprise gift they almost always end up in a drawer. The same goes for a dog sleeping bag over a bed — fussier, more expensive, and only some dogs will get inside one.
Finally, the first-aid kit. It’s the least exciting thing on this page and the one most likely to matter. A camper is often hours from a vet, and the difference between a clean bandaged pad and a bad night is a kit in the boot. Give it alongside something warmer so it doesn’t read as ominous.