Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to pick a puppy from a litter [title] Try to buy a puppy from a breeder instead of a pet store. [step] While it may be tempting to scoop up the adorable pup in a pet store window, buying a pup this way can be risky. Most pet store puppies are on their own in a small glass cage.

Ending1: The fact that they are quickly separated from their mother mother, however, can be a sign that they have been bred against their natural mother instinct. [substeps] Ask the breeder if they have a specific number of litters from which to choose. Ending2: Therefore, it's best to adopt from a breeder that's a bit older than you. [title] Pick a puppy that's well-fed. Ending3: So you won't get the opportunity to see how the pup interacts with his litter mates. This will make it difficult to assess the pup's personality and demeanor. Ending4: You don't want to be in the middle of a store where you find a puppy that you know the breeder or owner has a wary attitude toward. [title] Choose a breeder who is comfortable with you and your home.

Answer format: ending1/ending2/ending3/ending4