I applied Hartz Advance Care 3 in 1 to my 11 year old German Shepherd and within 4 days I had to have her put down. Did the Hartz product kill her? A jury would probably rule that it was the Lyme disease that killed her but folks, she was active, happy, and appeared to be in good health when I applied the flea and tick drops. She’s been kept up to date on all her shots, etc and the truth is I didn’t know she had lyme disease. But let’s think about this – I’ve been using Hartz products to protect her against ticks for years and …. wait a sec – isn’t lyme disease spead by ticks????? Maybe the jury should reconsider the verdict – Hartz did kill her because it didn’t prevent her from getting the ticks and then the re-application of Hartz 3 in 1 was more than her system could handle because of the lyme disease …….. is this going in circles and just keeps returning to Hartz products. No one can understand my loss – my frustration – my anger. She was my companion – I’m a retired senior and she was my constant companion. I put my trust in the Hartz products and now I’ve lost the trust and I’ve lost a friend.