DO NOT USE ANY HARTZ PRODUCTS. PERIOD. My cat got fleas and I turned to hartz because it was accessible and cheap. One of the biggest mistakes I have ever made. I followed every direction perfectly and even made sure he didn’t groom himself in the process. Hours later he was throwing up and not acting like his usual peppy self. I’m very disappointed that I let this happen. I should have searched for reviews first. He’s recovered now. unfortunately I’ve read that other family pets weren’t as fortunate. Why would trusted pet stores sell this garbage? I live to see the day this company eats the dirt. Burn in hell you degenerates.