Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to nurse a dog when it's sick [title] Give your dog medication. [step] Follow your veterinarian's dosing instructions to make sure your dog gets his medication regularly. To help you remember, create a simple tick box chart and note when you've give the medicine.

Ending1: If you need to give medication twice a day, it's most effective to give each dosage at twelve hour intervals. For example, give one dose at 8 am and the other at 8 pm. Ending2: This chart can be positioned anywhere on your dog's body. Jot down the dose, the pill in a pencil, and how you'll administer the medicine. Ending3: [substeps] If your dog has a medical condition, your vet may instruct you not to give her medication. You may also need to make an appointment if your dog doesn't experience any bad side effects from the medication. Ending4: Use the thermometers to mark dosages, duration, and levels of medication. [substeps] Be sure to note how often to administer medication and how often to take it, as well as how to dose it.

Answer format: ending1/ending2/ending3/ending4