Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to get through puppy adolescence [title] Know what to look for. [step] The age at which your puppy reaches adolescence depends on its breed. Generally, your puppy will enter adolescence when it's between six and 18 months old.

Ending1: If your puppy has a high-school diploma or ged, it might need a few years of studying to know what to look for. [substeps] Young puppy development is started by the early development of 18-year-olds in elementary and high school and at about that age they require a high school diploma (which is part part of a puppy's heritage). Ending2: Moreover, you'll probably notice a change in your dog's behavior. Your puppy might become moody, disobedient, unpredictable, or just a " brat " in general. Ending3: For small dogs, a puppy's maturity is typically usually around six months. [substeps] Males, on the other hand, should be aged for at least six months. Ending4: Although about 10 months old becomes more mature, you should still check with your veterinarian to see if your puppy needs to get vaccinated. [substeps] Expect a little bit of weight loss if you know the dog has a very small breed.

Answer format: ending1/ending2/ending3/ending4