Review on 🐱 Hartz UltraGuard Plus Reflective Flea & Tick Collar: Optimal Protection for Cats & Kittens by Justin Guldin

I bought these collars on subscription but ended up saving because they irritated our cats. When you activate one of these collars for the first time, the scent has a strong chemical odor. And all 6 cats in our yard, both internal and external, will scratch and lick collars. I worry if they lick it due to a toxic smell. It seemed to help the fleas to some extent, but unfortunately the effectiveness wears off due to the smell. Otherwise, your hands will also be covered with that chemical smell.