Gamma Dogs

The Gamma Dogs are three dogs that were mutated by Dr. David Banner and the quaternary antagonists of Ang Lee's Hulk.

Creation
David Banner took the DNA of his own son and experimented on three dogs to see how his son's "disease" would be replicated. The three dogs became enlarged and feral. Banner sent his mutated dogs to Betty Ross so they would eat her.

Demise
As Bruce received a phone call from his father, he learned that the dogs are after Betty and are willing to consumer her. Bruce became angry from this and became the Hulk. He eventually killed all three of the dogs.

Personality
The three dogs are orient towards David Banner, yet have very cruel tendencies. They don't like getting looked in the eyes.

Trivia

 * The dogs were foreshadowed by the prologue, where Bruce is playing with a plush dog at the age of five. In the film proper, the dogs represent the loss of innocence.