|Gender||Unknown (likely male)|
On Greg Heffley's birthday in June, his uncle Joe attends and brings Killer and his kids. Greg asks Joe to hint to his father that he should get a dog but regrets it after seeing how he goes about it.
After Greg opens his birthday presents, everyone goes into the dining room to have cake, only to find that Killer has beaten them to it. Instead of buying a new cake, Susan Heffley just cuts away the parts that the dog didn't touch. She cuts a big piece for Greg, who is no longer in the mood for cake, especially as Killer is throwing up birthday candles under the table.