My 13 year old dog just had a HORRIBLE reaction to Simple Guard 3. Walking funny, shaking, rubbing her face against everything. Poor thing, she was so uncomfortable. I didn't realize at first what was causing her symptons. I took her to vet (same VCA that sold me the SG3) and spent hundreds of dollars having her poked and tested to no avail. I even asked them if there could be a connection to the SG3 I had given her the day before, to which they showed no interest or knowledge...today I went online and now I am definitely sure...DO NOT USE SIMPLE GUARD!!! IT IS TOXIC!!! I thought my dog was going to die. Then the same vet that sold me that poison charged me hundreds of dollars to treat her, but still did not diagnose the problem...they want me to spend more on xrays, lab tests, etc. VCA is a greedy, corporate scammer who obviously doesn't care about our pets!View Thread