These have worked really well for my 2 dogs and I don't think I'd switch back to the liquid version ever. The collar is easy to put on, you don't need to remember monthly and it lasts all the warm/flea/tick season months. I put them on early-mid spring and leave them on right into winter and they have not had a single bug since they've worn them. They go swimming/paddle boarding with me and they get bathed usually once or twice a month with no issue.