From StrategyWiki, the free strategy guide and walkthrough wiki

[edit] Boss

When you collect the necessary powerups, you will enter wolf form. Your first attack is charging yourself at the enemy, and your second is to throw a ranged fireball.

The stage boss will stand on the right edge of the screen. It attacks by throwing its head some distance before it heads directly down. Try to avoid its heads, and attack the main body using your ground fireball.

Common attack patterns include:

• Sending three-and-a-half pairs at the extreme close and far ranges.
• Throwing three heads requiring you to dodge to the back, followed by a head at long range, requiring you to move forward again.
• Throwing heads in a semi-chaotic pattern.