If you own a dog, you must know the proud feeling of watching them grow bigger. One day, you have your little pup in your lap, and in no time, he turns into a mighty and strong protector. Time literally flies like an arrow when we are surrounded by these adorable pets. Twitter users have been posting before and after photos of their dogs, and it is quite shocking to see the dramatic changes a month or two can bring. It all started when @_ThatGuyFuller posted a photo of his Goldendoodle, and since then, the post got almost 300k retweets! Scroll through our curated list and check out all the incredible transformations!