Ryan Seacrest
"Happy #nationaldogday to my BFF!"
Ellen DeGeneres
"Happy #NationalDogDay! I’m celebrating with these three!"
Gillian Anderson
"...and that sleeping during the day is gender neutral. #Nelson #frenchbulldog #NationalDogDay."
Shay Mitchell
"Happy #NationalDogDay day to my sweet Angel ."
Alison Pill
"Happy National Dog Day! Henry was my best man at our wedding, here he is in formal wear. #henrychirpa."
Carrie Underwood
"In honor of #NationalDogDay here are my little fur bundles of joy, Ace and Penny...they are naughty and crazy and noisy, but I love 'em! #AdoptDontShop #rescuedog."
Hilary Swank
"#NationalDogDay is EVERY DAY in our pack!! #AdoptDontShop #FosteringSavesLives."
Paris Hilton
"Happy #NationalDogDay to all my @HiltonPets! Love my babies so much!"
Sarah Michelle Gellar
"#nationaldogday Happy doggy day (or everyday in my house) Our current #Dog Bella is a #bernesemountaindog and also the worlds biggest lap dog. Before Bella, was Tyson our #akita and one the smartest dogs I've ever met. I miss him every day. My first puppy Thor was a #maltese who loved artisanal beer. And I also included one dog, who was not mine, but was very special to me, Moose. Moose you were a jerk, but I loved you."