hartz ultra guard flea and tick collar

my cat blanco is one of 8 we have. he had a severe reaction to the hartz ultra guard collar. he wore it for 3 days when i noticed his neck looking funny. i took the collar off and saw that he has a raw ring around his neck. its horrible. i checked the others and they all seem fine but we immediately took thier collars off too. how awful a product this is.

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