I'm wondering if it was the Preventix Amitraz collar by Virbac.
I wouldn't recommend a collar for fleas but sometimes the spot-on products aren't great for ticks. I would think that Advantix would be fine though and I would choose that over a collar.
__________________ Crystal  , Ellie May (RIP)  , Rylee Finnegan  , and Gracie Boo🐶 |