Pets & Animals

New Pet Wellness Checklist: The First 90 Days

Updated Dec 30, 2025· 6 min read
Share
A puppy and kitten sitting together on a cozy blanket in a bright home setting.

In This Article

Key Takeaways

A veterinary exam within the first week is the single most important early step for any new pet.
Preventive care — vaccines, parasite control, and spay/neuter planning — should be addressed in the first month.
Socialisation and gentle habituation during the first 90 days shapes behaviour for years to come.
Consistent feeding schedules and portion guidance from a vet prevent common nutritional mistakes.
Tracking health changes from day one gives your vet invaluable context at every future appointment.
The first 90 days are a window: what you establish now becomes your pet's baseline for life.
30–60 min

Summary

22 items · 30–60 minutes to review; ongoing implementation over 90 days

Why the First 90 Days Are a Critical Window

The early weeks after bringing a pet home are far more than a settling-in period. For puppies and kittens especially, this phase overlaps with a sensitive developmental window during which socialisation, habituation to new environments, and early health interventions have an outsized and lasting effect. For adult or rescue animals, the first 90 days establish baseline behaviours, reveal hidden health issues, and set the tone for how your pet relates to you, your household, and veterinary care.

This checklist is designed to help responsible pet owners move through those first three months with intention — not anxiety. It covers the five pillars of early pet wellness: veterinary care, nutrition, environment, behaviour and socialisation, and ongoing health monitoring. Before diving in, see our guide on bringing a pet home for the first time for preparation steps you should take before your pet even arrives.

Required

Veterinary Clinic

Your primary resource for health exams, vaccination schedules, parasite prevention, and species-specific nutritional guidance throughout the 90-day period.

Required

Pet Health Journal or Notebook

Used to track weight, appetite, behaviour changes, stool quality, and any symptoms across the first 90 days — invaluable context for your vet.

Required

Accurate Digital Pet Scale

Enables consistent weekly weight monitoring at home, helping you detect early signs of nutritional or health problems.

Required

Microchip Registry Account

Ensures your contact information is linked to your pet's microchip number so they can be returned to you if lost.

Required

Positive Reinforcement Training Treats

Small, species-appropriate treats used as rewards during early training and habituation exercises.

Optional

Species-Appropriate Toothbrush and Toothpaste

Used to begin building your pet's tolerance for oral handling and early dental hygiene routines.

How to Use This Checklist

Items are grouped by category and tagged as must (non-negotiable for basic safety and health), should (strongly recommended for best outcomes), or nice to have (beneficial additions when time and resources allow). Work through each group in the first days, first month, and across the full 90-day period as indicated. Not every item applies to every species — a rabbit's needs differ from a dog's — so use your veterinarian's guidance to adapt accordingly.

Never Skip the First Veterinary Exam

A physical examination in the first week can reveal congenital issues, undetected parasites, respiratory infections, or other conditions that are not visible to the untrained eye. Early detection changes outcomes. Even if your pet came from a reputable breeder or rescue with a recent health certificate, an independent exam by your own veterinarian establishes a baseline and begins the vet-client-patient relationship that will serve your animal throughout its life.

As you track changes in weight, appetite, and behaviour over this period, consider starting a dedicated health record. Our article on keeping a pet health journal outlines a practical approach that makes every future vet visit more productive.

Veterinary Care (Week 1–4)

Schedule and attend a full wellness exam with a licensed veterinarian within the first seven days of bringing your pet home. Must
Bring any available health records, vaccination history, or paperwork from the breeder, shelter, or previous owner to the first appointment. Must
Discuss and begin or confirm a core vaccination schedule appropriate for your pet's species, age, and local disease risk. Must
Have your pet tested for common parasites — including intestinal worms, heartworm (dogs), and fleas or ticks — and begin a vet-recommended prevention protocol. Must
Discuss spay or neuter timing with your veterinarian if your pet has not already been altered. Should
Ask your vet about microchipping if your pet has not already been chipped, and register the chip with your contact details. Should

Nutrition and Feeding

Confirm an appropriate food type (dry, wet, or mixed) and portion size with your veterinarian based on your pet's species, age, weight, and health status. Must
Establish consistent feeding times and stick to them — irregular feeding can disrupt digestion and increase anxiety in many species. Must
Transition gradually to any new food over 7–10 days by mixing increasing amounts of the new food with the old to avoid gastrointestinal upset. Must
Ensure fresh water is available at all times and that water bowls or fountains are cleaned regularly. Must
Confirm with your vet which human foods or household plants are toxic to your specific pet species and remove them from accessible areas. Should

Environment and Safety

Pet-proof your home before or immediately after arrival — secure loose cords, chemicals, small swallowable objects, and any unsafe spaces. Must
Provide a designated safe space (crate, bed, or quiet room) where your pet can retreat without being disturbed, helping them decompress. Must
Ensure ID tags with current contact information are attached to a properly fitted collar from day one. Must
Introduce family members, especially children, to proper and gentle handling techniques before unsupervised interactions occur. Should

Behaviour and Socialisation (Days 1–90)

Begin gentle, positive exposure to different people, sounds, surfaces, and environments during the socialisation window — especially critical for puppies under 16 weeks. Must
Start basic reward-based training (sit, stay, name recognition) as early as the first week to build communication and trust. Should
Enrol puppies in a professionally run puppy class that uses positive reinforcement methods; this also provides structured socialisation with other dogs. Should
Introduce your pet gradually to car rides, grooming routines, and handling of paws, ears, and mouth to build tolerance for future vet and grooming visits. Should
Begin toothbrushing habituation early using species-appropriate toothpaste — even if full brushing is weeks away, getting your pet used to oral handling is a valuable start. Nice to have

Ongoing Health Monitoring (Days 1–90)

Weigh your pet weekly and log the results to catch unexpected weight gain or loss, which are often early indicators of health issues. Should
Note any changes in appetite, thirst, energy, coat condition, stool quality, or behaviour and bring these observations to your vet's attention promptly. Must

Building on the Foundation After Day 90

Once the first 90 days are behind you, the habits you've built become the scaffolding for lifelong wellness. A consistent daily routine — regular feeding times, structured exercise, and predictable rest — supports both physical health and emotional stability. Our guide to building a daily routine that works for your pet walks through what that structure looks like in practice.

Pay particular attention to dental health, which is often overlooked in new-pet checklists. Periodontal disease affects a significant proportion of adult pets, and habits established early — like toothbrushing tolerance — make a measurable difference. You can learn more in our piece on dental health in pets. If you notice behavioural changes at any point, the pet stress warning signs checklist can help you identify problems early before they escalate.

This article is for general informational and educational purposes only and does not constitute veterinary advice. Always consult a licensed veterinarian for guidance specific to your pet's health, species, age, and individual circumstances.

Pets & Animals Editorial Team is the collective byline for our editorial team and contributor network. Articles published under this byline or an editorial pen name are researched, written, and reviewed according to our editorial standards for clarity, consistency, and independence before publication.

View all articles by Pets & Animals Editorial Team →
Disclaimer: The content on this site is for informational purposes only and is not a substitute for professional advice. Always consult a qualified professional for guidance specific to your situation.