Avi K- I do that!!! Automatic instinct! I say Tehillim too. Years ago, when my brother was young, I heard him telling my mother that I am so scared of dogs that I make a bracha whenever I pass by one safely. I was like, “huh?” Turned out he heard me mumbling the above possuk and he assumed I was making a bracha!!
Once when I was with my brother, a dog started barking, and I got very scared. He reassured me by telling me that “barking dogs don’t bite.” He happens to be extremely knowledgeable so I figured he knew what he was talking about, and I calmed down. But then he added, “well, it can’t do two things with its mouth at one time, can it?”