Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to choose a healthy puppy [title] Get one at the right age. [step] In general, puppies should be kept with their mothers for at least the first eight weeks of their lives. If the dog breed is small, such as a yorkshire terrier, it is better for a puppy to live with her littermates or parents for the first 12 weeks so they can mature enough to live with other people and animals.

Ending1: [substeps] If you find a breeder who is selling puppies younger than eight weeks old, ask the breeder why, since it is too young. [title] Check the puppy's cleanliness. Ending2: After that, the puppy will need to be housebroken, until it reaches adulthood. [substeps] Puppies are generally small dogs, about 12-19% of the time. Ending3: [substeps] This also means keeping a puppy safe during the first 4 to 6 weeks of its life. This means ensuring that the puppy is raised within 2-3 months of the ownership of her mother. Ending4: [substeps] You can take a small dog for the first eight weeks and add in additional puppies later in life. [title] Pick a puppy that is sturdy and very alert.

Answer format: ending1/ending2/ending3/ending4