Depending on your needs:
Frontline
Frontline Plus
Advantage
Advantage II
Advantix
Advantix II
Advantage Multi
Program
Sentinel
Also Revolution, Trifexis, and Comfortis, but my personal preference is to avoid these ones entirely.
A lot of it will be based on what your vet recommends, how bad ticks are in your area, etc.
I use Sentinel or Frontline Plus as needed.
Are you currently giving a heartworm preventative?
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