Barrett Weimaraners are not treated with flea, tick or heartworm preventative medication before they go home. Please check with your veterinarian if you are unsure whether or not fleas, ticks, and heartworm are prevalent in your area and preventatively treat as needed. Seresto Collars are great for flea and tick prevention, and Heartgard (available with a prescription from your veterinarian) works well for heartworm prevention. Please do not use Comfortis or Trifexis (spinosad) or Bravecto, Nexgard, Credelio (lotilaner), or Simparica (isoxazoline) as a flea and tick preventative as that has been linked to neurological disorders (including tremors and seizures) in dogs related to Barrett Weimaraners. This can be purchased in-store at Petsmart, Petco, Target, Walmart, or Tractor Supply, or online at any dog supply retailer (Chewy, Amazon, etc.).