Hi, I have a 2 year old cavapoo who had his op age 6 months. He has always been super friendly to all owners and dogs we meet on our walks. Until a few weeks ago and a dog he had peviously met came up to say hello and my dog snarled and snapped at him, I was shocked. All ok for a week or so and we bumped into a lady walking her new puppy, my dog innitially went to say hello but when the puppy came up to him he snarled and snapped. This has happened more often last couple of weeks. It seems to be Pugs, Frenchies and staffies he doesn't like and any small puppy. Nothing bad happened yet but it scares me and I don't want him to pick up on my fear. I have no idea how to approach this and would welcomd any advice. with the majority of dogs he meets he is lovely and plays quite happily.