Thanks, good to know. That makes sense, but sometimes nature is weird, too, so you never know.Labeling is weird. A lot of times products are capable of things that they can't be labeled for until they jump through some regulatory hoops, even though it makes no sense whatsoever that a product would kill one species of tick but not another.
I'm having a vague memory I can't confirm that they are either just about to get approved to be able to label for deer ticks, or they just did, or something. Anyway, I'm personally confident that it does actually kill deer ticks.
ETA: If I didn't have neck-grabbing wrestlers in my house, I'd probably try the Seresto collars. But those things would last about two days on my dogs before they got torn off.