Killer

Killer is a stray dog that was found on Grandma Thora's porch. She has been to the pound many times. It is unknown who is her owner, but currently, Grandma Thora seems to own her. Pal and Amigo were once afraid of her because of her bite, but her reputation was saved when she rescued Nemo by barking at some firefighters on a rainy day. Killer is shown on the very early books as Grandma Thora's dog, but she isn't introduced on the TV series until season 9.