Watching Horror films, review all the available top ten lists. Some are pretty bad - as a result of one I watched "The Conjuring". Absolutely terrible. But it introduced me to the lead parapsychological investigators of the late 60's and early 70's, "Ed and Lorraine Warren", who's bio on Wiki was rather amusing.
From this to "Let the right one in" - a better quality film by far, an awful lot better thought out, some rather haunting themes, and a film that does a great job of integrating the elements of horror into day to day modern life. A lot to dwell on and consider - not, so much, horrifying, but it's there, it's there. No spoilers here.
So - one dog, one slight masterpiece, a few more to go...