I think it takes a special person or a memorable moment in time that has a lasting impression in us. I of course will talk about the dogs in our lives that live on well after they are gone and we still can get emotional when thinking about their special place in our hearts (hope that isn't sounding too like a Hallmark card). I think if you as anyone about a dog from their past they will almost immediately remember that special dog(s) and those moments with them and a joyful smile will come to their face. Every dog is special and the emotions and memories are all over the place from fun, crazy, loving and the occasional insane moments. The impressions last a lifetime as they should. Trewman left these for me to remember at a park in March of 2012. I still remember the moment taking this photo. I am glad I did.