Final answer:
A dog experiencing a high level of fear will usually exhibit ears pinned back, eyes averted or lowered, and lips pulled back and down.
Step-by-step explanation:
A dog experiencing a high level of fear will usually exhibit ears pinned back, eyes averted or lowered, and lips pulled back and down. This is a common behavior in dogs when they feel threatened or afraid. The dog may also show other signs of fear such as trembling, tail tucked between the legs, and attempts to escape or hide.