Bests & Worsts Reviews from Amazon

I purchased a collar for a small dog. Within 48 hours of installing the collar, my dog began acting strangely and exhibited signs of a bad reaction (coughing, eyes dilated, licking mouth and panting constantly, extreme nervousness, refusal to eat or drink) and hid in his crate, refusing to come out. I took him to our vet who performed some blood work and skin tests and bathed him in a special soap to remove any traces of the chemicals. Vet advised that the collar was releasing at least 3X the amount of chemical shown and the collar was not "time releasing" a specific amount as it should. The amount of chemical found on/in his skin/blood was a toxic amount which had caused the reaction.I was told that it was a good thing that I removed the collar immediately and sought medical attention as continued exposure could have killed him or caused permanent neurological damage. I had very high hopes as Bayer is a trusted family brand of products and am very disappointed in this product's poor performance. The collar was very expensive and I expected it to be of high quality. I know that occasionally a product is defective but this isn't rocket science. I'll go back to my $12 flea collar which works just fine and isn't poisoning my dog. Unfortunately, my dog is still acting fearful (vet advised this may take a while to subside) and I have a $172.00 vet bill to pay.