My cats don't get vaccinated every year either. They get all their shots when I first get them. My vet said that because they were all indoor only cats they can get the 1 year vaccination dose, but get it every 3 years. (I hope that makes sense.)

My cats never dart out of the house. Could they, yes, but they've never shown any interest in doing so. Sundae is the exception- she went through a short period of darting out but after being shot with the water bottle a few times she now won't go near the door.