I've done a couple of 1-2 weeks hikes with my dog and tent. Now I plan on doing the GR11 with him, a 900km trail across the Pyrenees in Europe.
Welcoming tips and lessons learned on doing longer hikes with your furry friend :)
I'll also share mine as I go.
It is not your hike, it's the dogs.
The dog can't tell you when it's tired, sore, hungry, thirsty, hurting, etc. so you have to find that extra energy and time throughout the day, everyday to make sure the dog is content/ happy/ healthy. Make sure to brush, check paws, teeth, clean, check for ticks or other bugs/bites. Paw protection is key!!! If you can train to wear boots that can help but I swear by "Mushers Secret". A little can go a long way. Always have an out for the worst case scenario. Better to end a trip early and be able to plan another than it is to seriously hurt your dog.
Look into freeze dried kibble for weight savings but make sure the dog has plenty of water. Learn what human foods are healthy for your pup and you can add variety to the trail diet. For example, on the VT Long Trail I would always resupply apples and share with my pup but when we did the CO Trail it was all about the carrots!
Would definitely recommend a dog harness with bag. Let the dog carry what he can but keep it to around 10-15% of total body weight. You'll see a lot of recommended brands for this but it really is trial and error to find one for your specific dog.
Last thing, and this is more of an ask. Please be a responsible hiker and dog owner. Keep the dog on leash when appropriate, it's for the dogs protection as much as for other trail users. Also, pick up your dogs crap or dig an appropriate cat hole and toss it in there.
I'm sure I'm forgetting tons of things I would want to share but if you have any specific questions don't hesitate to ask. My Australian Shepherd and I have done 100s if not 1000s of trail miles and she gets more excited than me when the backpacking gear comes out of the garage.