About one month ago I bought a Hartz Control Flea and Tick collar at Wal-Mart for my dog Roger. He is a 9 year-old Australian Shepherd. I put it on him that night and thought nothing of it.
Three days ago Roger had a gripping seizure. He was calmly snoozing at my feet one minute and convulsing, frothing at the mouth and stiff the next. To our knowledge, he’s never before had a seizure. I took him to the vet’s yesterday and he checked out okay. After some advice to look up the chemicals in the collar online, I found that one of the main ingredients, tetrachlorvinphos (an organophosphate), has been known to cause several side effects in both cats and dogs. I’m convinced this is the cause of Roger’s seizure and immediately removed the collar upon becoming knowledgeable of the effects.
Roger hasn’t had a seizure since, though it’s only been three days. However, I’m praying that since removing the collar, he won’t have another episode again. After perusing this site and the horror of my own experience, I certainly won’t be using any Hartz products, and I will be sure to warn others.