At the beginning of this project, I said you that I found the modelling section quite tricky. Don't let that put you off! It wasn't so much tricky to do, as tricky to describe what I was doing.
Your dog, or whatever your subject, will be different. However, the process will be the same:
1. Stop, look and think:
2. Visualise the head in the wood.
3. There is not a lot of wood to remove! This is quite a low relief carving, though it's big; so a lot of the lead is flat, just lightly skimmed. Take it easy.
4. Main shapes first. Details always come last.