Puppy Year One / Puppy glossary: vaccine, socialization and first-year terms
Puppy glossary: vaccine, socialization and first-year terms
Quick answerYour puppy's first vet visits come with a lot of new words. This glossary explains the common ones in everyday language and links to the guide on this site that covers each. It is general information, not veterinary advice.
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Published Oct 20, 2026 · Updated Oct 20, 2026 · By the Editorial team. General education, not veterinary advice and not yet individually reviewed by a licensed veterinarian. About and sources
Vaccines and diseases
Core vaccines
Under the AAHA canine vaccination guidelines, all dogs get the core vaccines: distemper, adenovirus, parvovirus (with or without parainfluenza), leptospira and rabies. Puppy vaccine schedule
Noncore vaccines
Vaccines recommended based on a dog's lifestyle and region, such as where it travels or what it is exposed to. Your vet decides which apply.
Combination vaccine
A single shot that covers several diseases. AAHA says puppies get at least 3 doses of the combination vaccine between 6 and 16 weeks of age, 2 to 4 weeks apart.
Booster
A later dose that keeps protection up after the first series. Your vet sets the timing.
Parvovirus
A contagious virus that is serious in young puppies and one of the main reasons the vaccine series matters. A puppy with vomiting, diarrhea or lethargy should be seen by a vet.
Distemper
A contagious viral disease listed among the core vaccines. Vaccination is how it is prevented.
Leptospirosis
A bacterial disease that is part of the AAHA core vaccine list for dogs. It spreads through the urine of infected animals and can also affect people.
Safe, positive exposure to people, animals, sounds, surfaces and places. The AVSAB says the primary and most important period is the first three months of life and puppies should be socialized before they are fully vaccinated, with care. Puppy socialization before vaccines are finished
Socialization window
The early period when puppies learn most easily about the world. The AVMA says puppies are most responsive to learning from unfamiliar dogs between 3 and 14 weeks. Socialization passport
Teething
When baby teeth fall out and adult teeth come in, usually around months 4 to 6. Puppies chew more during it, so give safe chew options. First-year timeline
Vet care and decisions
Deworming
Treatment for intestinal worms. Puppies are commonly dewormed on a schedule set by the vet, who may ask for a stool sample at the first visit. First vet visit checklist
Tick preventive
A product that protects against ticks. The CDC says to check outdoor pets for ticks every day and use a tick preventive on dogs. Ask your vet which product suits your puppy's age and weight. Ticks and parasites
Spay and neuter
Surgery that prevents a dog from reproducing. AAHA's 2019 proposed ages suggest earlier for small breeds and waiting until growth stops for large breeds. Your vet makes the call for your dog. Spay and neuter timing
Poison control
A 24-hour phone service for possible poisonings. ASPCA Poison Control and Pet Poison Helpline both run 24/7 and may charge a fee. Puppy-proofing
