Do ticks still jump on dogs when they've already been treated?

A tick might jump on the dog, even though the dog has been treated with a monthly Flea & tick preventative, but it will not stay on there as it will die in a few hours or sooner. A tick has to bite/suck the blood out of the dog for at least 12 hours before it can pass on the diseases it carries so the Preventative takes care of that, it kills the tick before it can pass anything on and then the tick just drops off.