I used cattle tags. Took one tag folded it and put a rivet through it
then threaded it on the dogs collar. I would use scissors to cut some of the tag off to make it smaller because I was concerned I’d
poison the dam dog. I mean two tags go on one cow so how much of a tag do you need for one dog? So it was guess work. That’s why I went to Soresto collars. But I will say with those cattle tags the ticks would almost jump off so you wouldn’t take any home with you. I had a female whose heat cycle was really messed up and I suspected the cattle tag. Never sure though. ?????