What is the Scooby Doo called with alien girl and dog that both Shaggy fall in love them movie called?

The Scooby Doo movie you're thinking of is called "Scooby-Doo on Zombie Island".

Here's why:

* Alien girl: The main female character is "Spooky Space Kook" who is from another planet.

* Dog: She has a pet alien dog called "Fido" who is Shaggy's rival for her affection.

* Shaggy falls in love: Shaggy develops a crush on Spooky Space Kook, although she isn't really interested in him romantically.

Let me know if you have any other questions about Scooby Doo movies!