I use a soresto collar.
I cut it into four equal pieces and use Chicago screws to attach to the inside of their daily collar.
From my observation I've seen dogs covered with ticks with other treatments because it requires the tick to bite the dog to kill it.
I don't want them on the dog period.
They can transfer to the vehicle,home, family, friends, or myself.
I had a rough period around 2016 that years later was suspected to be lymes.
I was a train wreck.
The topical treated dogs had dozens yet my dogs had none.
A good friend uses cattle tags and that also works