Name: Guilder
Japanese name: ギルダー
Sex: Male
Breed: Mixed breed

Guilder is a hunting dog and owned by Ninomiya. He lives together with Joe, Bomb and Jack. One day in the forest, Guilder meets Joe's brother Weed along with the rest of his pack mates. Together they scare of a bear threatening to kill them.

Later, Guilder and his pack mates are out to find a bear that has attacked a human. As they climb a rocky ledge of a mountain, they are bombarded with rocks. The bear is waiting on top of a cliff, pushing rocks down at them.
His leader, Joe, is seriously wounded by the bear.

As Guilder enters a fight with the Hybrid bear, he is decapitated by the bear's razor-sharp claws.