"Twas the Fight Before Christmas" is the second Christmas episode of the Disney Channel Original Series Dog With a Blog, originally aired as part of the network's annual "Fa-la-la-lidays" programming event on December 6, 2013.
When Ellen tells Avery that her sister is coming and how she hates her, Avery decides to set out to create the perfect Christmas in anticipation of a visit from Aunt Sigourney's ultra-competitive sister. A series of mishaps take place when Stan invites a stray dog named Sparky to spend the holiday with the family.
While Avery, Ellen and Bennett try to deal with Sigourney, Tyler, Chloe and Stan try to hide Sparky, from meet with Aunt Sigourney. But when Sparky runs away, he walks all over the house and he made Aunt Sigourney fall on the Christmas tree. Then Avery puts Sparky into a Christmas box with air holes. She leaves it on her bed and when Bennett sees it he puts it under the tree.
When they have Christmas dinner, Sigourney compliments how good is Ellen's soup, that she actually ordered from the restaurant. When Bennett brings chicken to the table, it starts to move and Sparky comes out. Than Ellen starts to laugh and says that the christmas at her house isn't perfect. Than Sigourney starts to cry and says that she is lonley at christmas and she says that she pretended that she is not lonely, but actually she wants to have family and christmas. Than they all hug and tell Aunt Sigourney that she has a family.
In the end, Stan writes a blog how Aunt Sigourney adopted Sparky and renamed him as Snarky.