Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to apply frontline [title] Buy the correct type of frontline. [step] You can purchase frontline at a pet store or your vet's office. You also may be able to get frontline at some drug stores, like walgreens.

Ending1: [substeps] A french bulldog dog could put frontline on its teeth. [title] Get a shirt with frontline written on it. Ending2: It's a good idea to buy frontline from a vet, however, as a veterinarian can a make sure you get the right product. [substeps] Frontline makes flea and tick treatments for dogs as well as cats. Ending3: To apply frontline to you mouth, stop into an office supply store or shops that specialize in skinning dogs. The process of applying frontline to your mouth and using the proper template is similar to using a toothbrush that you use for cleaning. Ending4: [title] Treat your skin with frontline after an injection. [step] Using frontline in any kind of ingrown hair may lead to a flare up in the follicle.

Answer format: ending1/ending2/ending3/ending4