Find a wolf in a Taiga, Snowy Taiga, Grove, Old Growth Pine Taiga, Old Growth Spruce Taiga, or Forest biome
Hold a bone in your hand
Approach the wolf slowly
Right-click or tap the wolf with the bone
Repeat with more bones until hearts appear
Once tamed, the wolf becomes your dog
Optionally use a dye on the collar to change its color
Optionally feed the dog meat to heal it