Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to treat mastitis in dogs [title] Start your dog on antibiotics. [step] Since mastitis is a bacterial infection of the mammary glands, the vet will prescribe antibiotics for your dog to take. This will treat the cause of the mastitis and the signs of mastitis should soon disappear.

Ending1: [substeps] Make sure to check on your dog with acetaminophen or another drug carefully, so that your dog will not be in too much pain when the drug is given. [title] Consider treating mastitis with oral antibiotics. Ending2: This is because the antibiotics are great in killing bacteria. [substeps] Have your vet prescribe antibiotics based on the antibiotic's effectiveness. Ending3: If she's still nursing the puppies, the vet will choose an antibiotic that is safe for the pups to ingest through her milk. [substeps] Be sure to give the full course of antibiotics, even if your dog's mastitis improves. Ending4: Especially if you are worried about your dog getting mastitis, you should begin giving him antibiotic along with other antibiotics in such cases. There are many different antibiotics they come in, so it is always very important to choose the best one for your dog to receive it.

Answer format: ending1/ending2/ending3/ending4