. >> reporter: herman's owner, david yip, a 37-year-old bachelor, an overworked sales manager who says this little pooch changed his life. >> he's the first dog i've ever had. i was in a client's office last year. they asked me to dogsit a couple of weeks when they went on family vacation. when he had to go home i was a little bummed out. lucky, he was the last left out of the litter. >> reporter: david rediscovered his youthful love of photography. >> i started taking pictures of him. >> reporter: a two-pound puppy. >> the pictures started getting popular so i started his own instagram. people started liking it online. >> reporter: boom, an instagram star is born. it's the secret sauce to social success. one part adorable pet, two parts cute clothing, three parts great lighting. and voila, a pic made for instagram. with the world-class caption game. "hey, what's cooking? "posing with great goose, "who wants to pawty with me?" sitting at the "nightline" even correspond desk? really, you have to be this cute all the time? >> good captioning is important. it's telling a story, still givi