Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to prevent canine distemper [title] Vaccinate a puppy quickly. [step] A puppy should be given a full course of vaccinations as soon as possible. Typically the first dose of vaccination is given from 6-8 weeks of age, and then every 3-4 weeks until the pup reaches 16-20 weeks of age.

Ending1: Waiting for the puppy to start biting during this time can lead to foreclosure on the breeder and liver, so it's important to check with the breeder. [substeps] Use a sterile injection with an appropriate dose of antibiotics. Ending2: [substeps] When the puppy reaches around 14 months of age it requires a top-up booster vaccination. After that, it will need another booster every three years for the rest of its life. Ending3: The vaccination schedule should be very similar to the home care schedule for vaccinations. Set the class of vaccines as early as possible to prevent dehydration and damage to the puppies. Ending4: Puppies should no longer have 20 minutes to run outside and pee, but should be given not less than 70 minutes before age 12. [substeps] You should also limit your dog's activity in the first 24 hours after recovery.

Answer format: ending1/ending2/ending3/ending4