To address everyone’s questions about water exposure . . .
Last summer was asked by a colleague who does small animal relief work to use my dog as a “test subject” for her main clinic to see what kind of results were to be had before they started recommending/selling the collar (I think because she knows I’m a nut job and am extremely good about going over my dog with a fine tooth comb, literally, after significant tick exposure). As the diligent, non-small animal vet that I am, I did a lot of reading on the product and spoke with a Beyer rep, particularly about the water exposure issues, because my dog is in the water almost every day in the summer.
A. Taking the collar off with water exposure, does not extend the useful life - the chemicals are not being washed out/off of the collar.
B. The tick portion, Flumethrin, binds very tightly to the hair shaft and is NOT the concern with water exposure. Imidacloprid, however does not bind as tightly and therefore must be redeposited into/on the skin with each water exposure.
C. The type/composition of the water, including the use of soap, doesn’t have any effect on life either.
D. Simply put, more water exposure = more redeposition of Imidacloprid = shorter collar life.
The recommendation with more than once monthly water exposure is 5 months. They can’t offer an exact time frame because, obviously, it really does depend on if your dog is in the water once a week or every day.
Anecdotally, my dog is a 38 pound mix that swims every day in the summer, and will go in multiple times a day if allowed. As I said, I’m a nut job, and I began even closer monitoring at 4 months and replaced the collar at 5 months with no evidence of decreasing efficacy last fall. I’m hitting 7 months tomorrow, and will change as a precaution, since it has been warm and he has been swimming again in the past month/month and a half.
I have been pleased with the efficacy, I do occasionally find ticks but the repellancy isn’t 100% with any product, so I don’t consider finding an unfed tick a failure. I am also thrilled with not having a greasy swath down my dog’s back for a week every month (his hair coat is weird and the carrier for Advantix leaves him a mess).