1. Drop one cooked meat on the ground.

2. Doggo will come and sniff the food. Stay on the side of doggo

3. Doggo will lower his head and eat the food. Now you have a short time to pet it. (E on Pc)

4. Doggo will walk away an come back for step one - Repeat

If you drop two times one meat the doggo will stay and you can tame him faster skipping the walking away.