How to choose a tick tablet
Pick the tablet by the dog's weight — each brand has its own ranges (e.g. 4–10 or 10–25 kg). Dogs usually eat chewables like a treat and water doesn't wash them off, so they suit dogs that swim. NexGard and Simparica last a month, Bravecto up to 12 weeks; NexGard Spectra and Credelio Plus also protect against worms.
The tablet works once a tick attaches and gets a dose, so still check your dog after walks. For puppies younger than the stated age, pregnant dogs and dogs with health problems — only as prescribed by a vet.