When it comes to the Internet, cute critters like Grumpy Cat and Boo the Pomeranian reign supreme. It's not just the adorable factor that gets the attention - and money - of legions of fans. Behind Grumpy and Boo are clever, well-orchestrated IMC campaigns that have propelled them beyond the fame of memes and viral videos to global stardom resulting in books, calendars, stuffed toys and most important, revenue. Most Internet-famous pets come from humble beginnings, like an unassuming YouTube video, a #CatsOfInstagram Instagram account or a casual Facebook post. Some enjoy 15 minutes of fame and fade into the scenery. Others enjoy long-term success, but only with help from marketing and communications tactics. Here are the IMC secrets that have kept both Grumpy and Boo top of mind in this cluttered pet market. 1. Traditional public relations coupled with social media. Grumpy Cat would not be the sensation she is without an incredibly strong social media presence, coupled with enough PR savvy to launch a media tour including office visits at outlets like Buzzfeed. Not long after she gained popularity online, she was front page news in The Wall Street Journal and New York magazine. She's also been a star on the stage of major events like SXSW, reminding us that being "on the ground" is still an important part of the mix. Boo the Pomeranian, aka "The Cutest Dog in the World," is another great example of IMC in action. 2. Product associations.