Wide variety of uses. Flea collars are claimed to have 3 months duration of effectiveness. Other cholinesterase inhibitors should not be sued on animals with the collars. Dog fea collars should not be used on cats, whippets, or greyhounds. Contact dermatitis frequently occurs under the flea collars.
Some animals are sufficiently sensitive that the collars can cause systemic effects, e.g., miosis.
Simultaneous use of flea collars on several cats and a Shell pest strip in a small room caused organophosphate toxicity in one cattery. Ronnel Ronnel is among the least toxic organophosphates Various formulations include ronnel. Combined oral and topical treatment is claimed superior to either alone for some conditions. The carbamates typically have a lower dermal toxicity than the organophosphates, but there are exceptions. Carbamates are reversible and pralidoxime may increase their toxicity.