National Puppy Day took place yesterday and was easily the most coo-inducing day of 2015 with #NationalPuppyDay generating thousands of posts on Twitter, Instagram and Facebook. Even the biggest A-listers weren't immune to sharing a snap of their cute pooch with Kylie Jenner, Justin Bieber and Ariana Grande among those to upload a picture. According to the official National Puppy Day website the purpose of the day is to celebrate the unconditional love that dogs bring into our lives but also to raise awareness of puppy mills in a mission to get puppy-free pet shops across the USA. Yesterday was National Puppy Day which saw many people taking to the Internet to share pictures of their pooches with #NationalPuppyDay. Justin Bieber shared this snap of his new dog Esther . The day is also used as a way of encouraging the public to adopt orphaned puppies  with celebrities joining the cause with Kate Upton sharing an image on Instagram encouraging her followers to adopt rather than buy a puppy. Now considered an international celebration National Puppy Day was founded in 2006 by Celebrity Pet & Home Lifestyle Expert and Author, Colleen Paige and has trended worldwode on Twitter since 2012. Julianne Hough often posts pictures of her two spaniels on Instagram so couldn't resist sharing a few extra for National Puppy Day where she claimed she loved them more than 'anything on the planet' Ariana Grande celebrated by giving her pooch a sweet treat . Kylie Jenner made sure that her pup Bambi got involved in the social media action . As well as National Puppy Day, Colleen is also the founder of National Dog Day, National Cat Day, National Mutt Day, National Pet Travel Safety Day and National Wildlife Day. But National Puppy Day is easily the most eagerly awaited and it is not surprising considering the deluge of cuteness that hit the Internet with Instagram receiving over 878,000 posts in just 24 hours. Now brace yourself for some serious cooing as we pick our favourite posts. Girls star Allison Williams took the opportunity to announce the news that she had adopted a dog on Facebook . Star of Glee Lauren Potter shared images of her three favourite mutts . American television host shared this image of his French Bulldog hard at work . In order to get the best angle on their mutts several owners chose to showcase them mid air . This Spritely Bichon Frise looks thrilled to be subject of the camera . If you didn't think Corgis could get any cuter try them at three weeks . Puppies are cute enough as it is but add a jumper and you have pooch perfection . The IT dog of this decade the pug featured heavily in the hashtag, with John Lewis sharing this stylish snap .
National Puppy Day is a holiday that takes place on 23rd March . Founded by Colleen Paige it aims to increase awareness of puppy mills as well as encourage adoption of unwanted puppies . Celebrities took to social networks to post images of their pups in honour of the day with the hashtag #NationalPuppyDay . Instagram received over 800,000 cute puppy posts .