Deagle113
Citizen of Zooville
Most of the products absorbed through the skin (like a Seresto collar and the ones you squeeze on the back) kill ticks anywhere from 4 hours to 24 after they attach. Just as an example, the two ingredients in Seresto—Imidacloprid and flumethrin—bind together as a polymer and spread their way down the animal. Both of these work on central and peripheral nervous systems of ticks to paralyze and kill them. Imidacloprid is synthetically similar to nicotine, all the tick’s nerves simply continue firing until it dies.Something that has always been on my mind is whether there is an advantage to using a Seresto collar as opposed to the topical liquid and if either of them actually helps. When I owned, she had the collar on and she would be a tick magnet. I was told that it doesn't keep ticks away, but when they try to feed they'll die from what is secreted through the blood and then fall off. It didn't seem to happen that way and she was positive for two of the three big ones and when I took her harness off one time I saw the largest bloated tick I had ever seen
However! Though these drugs work well, you should still remove ticks after hiking—most tick borne diseases take a day or two of feeding to transmit, and on the off chance that you get a super tick say, that takes 24 hours to die (maybe you are at the tail end of the 8 months of Seresto so the dose is much less) in combo with a whopping dose of Lyme in that particular tick, you could theoretically get infection—though it would be pretty rare on prevention.
Just because your doggo popped up positive on the test didn’t mean she had an active infection. Those tests work by detecting antibodies, (proteins made by your white blood cells that stick to pathogens to detect and kill them) to the four major tick diseases in the US. Antibodies stick around even after clearing an infection, so a positive means the dog has been exposed to that agent at one time, but not necessarily actively infected.
Good medical practice involves always interpreting tests in light of the whole animal and clinical picture, and treating accordingly.