Hartz Flea & Tick Collar

We recently had used the Hartz Flea & Tick Collar on our mini pinscher. He’s a tough little dog very strong. After about a week of him having this flea/tick collar on he started to become extremely aggressive, bearing teeth when we wanted to get close to him. He was never be calm always tearing around the house as if he has gone crazy. This went on for weeks and we could not figure out what was wrong with him. My husband suggested that perhaps it was the flea/tick collar, so we experimented and have finally taken it off of him and now a week later he is almost back to his normal self. Calm lap dog. Of course he still plays and chews, however he is not bearing his teeth and not tearing around the house like a "mad dog". We also experienced this with the Advantix brand flea/tick collar. We were unsuccessful using the frontline liquid drops. The collar seemed to work great except for the fact that the chemicals drove him "crazy". We now use a flea/tick spray which work great.
Thanks for listening

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