The best flea and tick treatment for dogs are Simparica Trio Chewable Tablets for dogs.
Also giving the dog a flea bath with flea shampoo and physically removing any visible ticks is a good idea and good way to get rid of ticks on your dog.
A flea dip is also a good way to get rid of fleas on your dog which can be done at home or at a vet or pet shop or a pet grooming service.
Prescription flea and tick preventatives require a prescription from your veterinarian, and they typically cost a little more than OTC options.
Most veterinarians recommend prescription products, as they are typically more effective and safer for your dog.
Oral flea and tick preventatives, particularly those containing the isoxazoline class of drugs, have been linked to serious side effects in dogs, including neurological damage such as seizures and muscle tremors, as indicated by FDA warnings.