Lets hope your dad never sees what lepto or parvo can do to a dog
I vaccinate and boost as others have mentioned, if I want to put them in kennels I need them, also we have been looking at emmigrating and would need the dogs to be upto date. I know a couple of vets who don't believe annual boosters are neccersary as the innoculations last longer than a year but this is done for ease, and i'm sure for profit.