Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to deal with newborn puppy nipple guarding [title] Weigh your puppies daily. [step] If you have a large litter of puppies, you should weigh each puppy daily. This will help you track their weight gain and make sure that each pup is getting its dietary needs met.

Ending1: You should weigh both puppies daily for the first two weeks. [substeps] Second and third week puppies are considered rough and if you left pups with lactating mothers their weight may decrease. Ending2: [substeps] Weigh your puppy once a day and track their weight in a journal or app. Weigh the puppies daily for the first 3 months, then weigh them once a day for a few weeks. Ending3: By weighing puppies, you will be able to know whether they need to be examined or if they haven't had adult (pre-menstrual) milk. [title] Check if your puppies are gaining weight. Ending4: This will also help you highlight which puppies are nipple guarding and which puppies are malnourished. [substeps] For the best results, use an electronic scale designed for weighing small animals.

Answer format: ending1/ending2/ending3/ending4