found a tick on one of my chock labs this afternoon. this is my baby girl & she's been all over the place, duck hunting , mountains ect. never seen one on her before. had her & the male to the river the other day (same place i always take them) & was just giveing her some loveing & scrubing her down & found this damn tick. anybody know of a way to keep ticks off of-big-dogs? iv'e looked before & seen drops for the small dogs but havent seen any thing for large ones. shots maybe?