Sparky is a stray dog that was found by Stan in the streets of Christmas. Stan snuck her into the James-Jennings house and tried to hide her during Aunt Sigourney's visit. However, she gets loose and is discovered by Tyler and Chloe, who lose her again until Avery found out and had her wrapped in a Christmas box until her aunt leaves. However, Bennett mistakes the box for a Christmas presents and places it under the tree. Sparky escapes again and was next seen jumping out of the Christmas turkey, exposing herself to the rest of the family. According to Stan, she was adopted by Sigourney and was renamed "Snarky".
- Sparky being renamed Snarky possibly references Sigourney's personality against Ellen.
- She's the third dog to have a known name. Followed by Evita and Mandy.