Ryan Reynolds and Blake Lively never miss an opportunity to troll each other on the internet and this week, the hilarious couple found a new excuse to playfully drag each other on social media: Their dog's birthday. On Friday, Reynolds took to Instagram to pay tribute to the family pup, Baxter, with a sweet post that included two pictures of the actor and dog getting their snuggle on, along with the following, objectively funny caption: "Happy Birthday, Bax.