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Killer is Grandma Thora's pet dog.

Personality

Since Killer has spent so much time in the pound, without a real home, she became aggressive towards other dogs. She scared D.W. when she startled her in the kitchen when they first met. Pal and Amigo were once afraid of her after she bit them. When Grandma Thora decided to keep her, she told her she needed to be nice to her grandchildren and other dogs if she wanted to stay with her. The other dogs were still weary of her however. Her reputation was saved when she rescued Nemo from a tree by barking at some firefighters on a rainy day.

Her debut in the books was at the same time as Grandma Thora, but she isn't introduced on the TV series until season 9. It is unknown how she became Grandma Thora's dog in the books at this time.

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