When Should Puppies and Kittens Get Their First Round of Core Vaccines?

Early protection comes in a series

Puppies and kittens do not get a single shot and finish. Core vaccines are given as a series of doses spaced a few weeks apart during the first months of life. Related: Which Non-Core Vaccines Does an Indoor Cat or an Apartment Dog Actually Need Each Year?

The series exists because a young animal's immune response builds over several rounds, not all at once.

Keep reading: How Do Vet Clinics Keep Pet Vaccination Records From Falling Out of Date?, What Should a Groomer Do When a Dog's Rabies Vaccine Has Lapsed?, Why Do So Many Pet Owners Miss Their Annual Vaccination Due Dates?. See how VaxRemindr helps you pet vaccination due-date reminders for owners.

Timing follows the veterinarian's guidance

The exact start date and spacing should follow a veterinarian's recommendation, which accounts for the animal's age, health, and local disease risk.

This article is general guidance, not a medical schedule. A vet sets the specific plan for each pet.

Missing a dose sets the series back

Because each dose builds on the last, a missed appointment in the series can mean less protection until the schedule is back on track.

This is exactly where reminders help, keeping a new owner on the series through a busy first few months with a puppy or kitten. Related: Why Do So Many Pet Owners Miss Their Annual Vaccination Due Dates?

Set the next date at every visit

The simplest way to keep a young pet on track is to leave each visit with the next date already set and a reminder queued. Related: How Do Vet Clinics Keep Pet Vaccination Records From Falling Out of Date?

That turns a multi-dose series into a sequence of clear, booked steps rather than a schedule the owner has to reconstruct. Related: How Do You Keep Vaccine Schedules Straight in a Household With Three or More Pets?