Dario, the Leonberger that competed at the Westminster Kennel Club Dog Show, captured the hearts of dog lovers everywhere with his canine charisma and desire for snacks. The dog has become an Internet favorite after he tugged at his handler Sam Mammano’s pocket in the competition ring. “Initially, I was very upset and disappointed because I knew that the judge would not give him a second look after that,” Dario’s owner, Alida Greendyk, said on “Good Morning America.” “I had heard the next morning that he had already become an overnight sensation and I couldn’t believe it.