Just FYI... Bravecto quits working for one type of tick (I'm sorry, I can't recall off the top of my head which one) after only two months, so if those particular ticks are a problem, you may want to stay away from Bravecto.I just started using Nexguard (2 doses). My Dutch gets some diarrhea in the first 24 hours and then we are good to go. Avantix II was not working well. I had ticks showing up embedded 3 weeks after exposure within the 30 days of the Avantix. Not okay with me. I hate ticks. I have been told that Bavecto is very similar chemically to Nexguard. If all goes well with Nexguard I may try the Barvecto as I love the idea of a 3 month fix.