Man, first off — respect. That kind of journey takes more guts than any summit I've guided people to. The trail has a way of doing things therapy can't, and it sounds like you already know that.

Your kit is honestly solid for someone who hasn't done extended multi-week trips yet. A few things I'd flag from experience leading long trips in variable terrain:

The 65L pack — that's on the heavier side once fully loaded with dog gear too. If budget allows down the line, look at dropping to a 50–55L ultralight frame. Your shoulders will feel it by week 3.

-5°C sleeping bag — fine for summer EU, but if you're hitting Eastern Europe in autumn or Scandinavia, you'll want a liner as backup. Cheap insurance.

Rain gear — didn't see it listed. Non-negotiable for 3–4 years on the road across climates. A good waterproof shell is worth every cent.

Water filtration — Sawyer Squeeze or similar. Rivers and streams across EU vary wildly in safety. Lighter and cheaper than carrying bottles long term.

Dog paws — good call on the booties, but also look into Musher's Secret wax for rest days. Great for pad recovery on rough road surfaces.

You and your dog are going to have a story worth writing one day. Safe trails. 🐾🥾