Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to treat mother dogs with sore or infected nipples [title] Make sure that the mother's nipples are used equally. [step] In order for nipples to stay in good shape, they should be used but not abused. A nipple that is overused can get irritated and sore rather quickly.

Ending1: Make sure that the mother's nipples are not torn through by scratching them. Itching or itchiness can be caused by irritation in the vagina and from over activity as well as trauma. Ending2: To help alleviate this soreness and help the nipple recover, make sure the puppies are using all nipples equally. [substeps] However, a nipple should not be completely abandoned indefinitely. Ending3: Avoid taping the nipples and items with adhesive tape because this could loosen the contract between the mother's breasts and cause unwanted nipple tearing. [substeps] Instead, place your nipples in a cup of water that is 3/4 inch (1.9 ml). Ending4: Only use the nipple if you absolutely must get the dog out. Abused nipples are reused at least once a day.

Answer format: ending1/ending2/ending3/ending4