Key Takeaways
Summary
22 items · 30–60 minutes to review; ongoing tasks spread across 90 days
Why the First 90 Days Matter Most
Bringing a new pet home is exciting — and a little overwhelming. In the first three months, you're establishing routines, building trust, and making a series of health decisions that will shape your pet's wellbeing for years to come. The good news: none of these decisions require a veterinary degree. They do, however, require a plan.
This checklist is organized by priority and timeline so you can move through it without second-guessing what to tackle first. Whether you've adopted a puppy, kitten, adult dog, or adult cat, most of these steps apply. Where timing or species matters, we've noted it.
Once you're through the first 90 days, you'll be well-prepared for the rhythm of ongoing care. Our guide to annual vet visits explains exactly what to expect at each yearly checkup going forward.
Week 1: Immediate Priorities
Weeks 2–4: Vaccinations and Parasite Prevention
Month 1–2: Nutrition and Weight
Month 2–3: Spay, Neuter, and Ongoing Scheduling
Ongoing: Dental and Behavioral Health
Tools and Resources You'll Need
Before you dive into the checklist, gather the basics. Having these in place makes every step easier — and prevents scrambling when something urgent comes up.
Licensed veterinarian
Your primary resource for all health decisions — find one before bringing your pet home if possible.
Pet carrier or travel crate
Required for safe transport to vet appointments, especially for cats and small dogs.
Digital kitchen scale
Useful for weighing small pets at home and measuring food portions accurately.
Health record folder or app
Keeps vaccination records, vet visit notes, and microchip numbers organized and accessible.
Pet first-aid reference guide
Helps you recognize symptoms and decide whether a situation warrants an emergency visit.
If your pet came with any paperwork from a rescue, shelter, or breeder, locate it now. Prior vaccination records, deworming history, and microchip numbers are all useful at your first vet appointment.
Important Warnings for New Pet Owners
Don't Skip Parasite Prevention in Early Months
Puppies and kittens are especially vulnerable to parasites like roundworms, hookworms, and fleas, which can cause serious illness or anemia at young ages. Many pets carry parasites at adoption without any outward signs. Starting prevention early — and completing any prescribed deworming course fully — is not optional. Ask your vet which products are safe for your pet's age and weight, since some adult formulations are not appropriate for very young animals.
Avoid Unverified Health Advice Online
Social media and pet forums are full of well-meaning but inaccurate health recommendations, including advice about skipping vaccines, using home remedies for parasites, or delaying spay/neuter based on anecdotal experience. Always run decisions about your pet's health through a licensed veterinarian who knows your specific animal. General online guidance — including this checklist — is a starting point, not a substitute for professional care.
Once your pet's immediate health foundation is established, behavioral development becomes the next priority. Puppies especially have a narrow socialization window — our article on socializing a puppy explains how to use it effectively. And when you're ready to move into training, the pre-session training checklist is a practical next step.
One area many new owners overlook entirely: dental health. Periodontal disease is among the most common conditions vets treat, and habits formed early make a real difference. See our overview of dental health in dogs and cats for a plain-English breakdown. Finally, bookmark our guide on when to call the vet right now — knowing the difference between a crisis and a can-wait situation is one of the most valuable things a new owner can learn.
This checklist is for general informational purposes only and is not a substitute for professional veterinary advice. Always consult a licensed veterinarian for guidance specific to your pet's health, breed, age, and medical history.