The Ultimate Guide to Comprehensive Care for Dogs Aged 1-3

ImmunityPreventionMeongsiljang Veterinary Advisory Board

The adult years, from 1 to 3 years of age, are a golden period for laying the foundation of lifelong health. We’ve outlined the essential comprehensive care points you must attend to, including diet, exercise, vaccinations, and health check-ups.

What is the Adult Stage (1-3 Years)? Laying the Foundation for Lifelong Health

The image of a healthy adult dog between 1 and 3 years old playing and running around.

The adult years, from 1 to 3 years of age, are a golden period for dogs when growth is complete and physical functions are at their most stable, laying the foundation for lifelong health. The key focus during this stage is establishing prevention-centered habits. While the extent to which lifestyle factors such as diet, exercise, and health screenings impact health in senior years is not yet fully understood, it is well-established that obesity shortens a dog’s lifespan and diminishes its quality of life. Additionally, the risk of chronic diseases increases each year as dogs age, so it is essential to ensure annual health check-ups and weight management, even in the absence of symptoms.

What to Check Before Starting Adult Dog Care

Before starting any care plan, it’s important to first assess your pet’s current health status. Please gather information on whether they’ve been spayed or neutered, their current weight and body condition score (BCS), recent vaccination records, and any underlying health conditions. Pets that are spayed/neutered or have low activity levels require less daily energy (maintenance energy requirement) than active dogs, making them more prone to weight gain even when fed the same amount. In fact, the maintenance energy requirement for inactive dogs is significantly lower than for active ones. Following standard feeding guidelines without considering your pet’s individual condition can lead to obesity.

Five Essential Care Priorities for Adult Dogs

For adult dogs aged 1 to 3, there are five essential care priorities.

Diet Management: Transition to adult dog food and maintain an optimal weight.

Exercise: Ensure 30 to 90 minutes of daily activity tailored to the dog’s breed and body type.

Vaccinations and Preventatives: Administer booster shots for core vaccines and rabies, and provide heartworm prevention.

Dental Care: Brush teeth daily and consider professional dental cleaning once a year.

Regular Check-ups: Schedule an annual comprehensive health exam, including blood work, cardiac, and joint assessments.

If implementing all five seems overwhelming, start with these three: diet, exercise, and regular check-ups.

Infographic: 5 Essential Care Areas for Adult Dogs

Diet Management: Transitioning from Puppy Food to Adult Dog Food

Small breeds typically reach adulthood at 9–12 months of age, while large breeds do so around 12–18 months. This is the time to transition from puppy food to adult dog food. Puppy formulas are designed with higher levels of protein, fat, and calories, so continuing to feed them to adult dogs increases the risk of obesity. Make the switch gradually over 7–10 days by slowly adjusting the ratio of old to new food. For safety, choose a food labeled “Adult Maintenance” according to the Association of American Feed Control Officials (AAFCO) standards.

A puppy that happily eats adult dog food

Reference Guidelines for Daily Feeding Amounts by Weight

Item	Small dogs (~5 kg)	Medium dogs (5–15 kg)	Large dogs (15–30 kg)	Giant dogs (30 kg+)
Daily calories	200–400 kcal	400–900 kcal	900–1,500 kcal	1,500–2,200 kcal
Daily feeding amount	60–120 g	120–250 g	250–400 g	400–600 g
Feeding frequency	2 times	2 times	1–2 times	1–2 times
Water intake	150–300 ml	300–750 ml	750–1,500 ml	1,500–2,500 ml

Calories and ingredients vary by food product, so always check the recommended feeding chart for that specific food. Adjustment of ±20% is needed depending on neutering status and activity level.

Exercise for Adult Dogs: Adjusting Based on Breed and Body Type

The appropriate amount of exercise for an adult dog varies significantly by breed. Small dogs (e.g., Maltese, Poodle): 30–45 minutes per day, split into two walks Medium dogs (e.g., Beagle, Cocker Spaniel): 45–75 minutes per day, split into two walks Large, active dogs (e.g., Labrador Retriever, Border Collie): 90+ minutes per day, including running and play Brachycephalic breeds (e.g., Bulldog, Pug): 20–30 minutes per day; exercise with caution on hot days Insufficient exercise can lead not only to obesity but also to separation anxiety and destructive behaviors. Base your routine on flat-surface walks that are gentle on the joints, and be sure to include dedicated time for running or play once or twice a week.

An adult dog exercising while walking with its owner

Vaccinations and Parasite Prevention Schedule for Adult Dogs

Even after their first year, dogs need booster vaccinations to maintain their immune system. It is standard practice to administer the core combination vaccine (DHPPL) and the rabies vaccine either once a year or once every three years, depending on your veterinarian’s recommendation. The kennel cough (tracheobronchitis) vaccine is essential if your dog will be staying at a boarding facility or daycare. You must also diligently administer monthly preventive treatments for external parasites (ticks and fleas) and internal parasites (heartworms and roundworms). Heartworm disease is transmitted by mosquitoes and is difficult to treat once infection occurs, making prevention critically important.

Adult dogs receiving vaccinations from a veterinarian

Breed-Specific Precautions: Checking for Drug Sensitivity Genes (MDR1)

Certain breeds, such as Collies, Border Collies, Shetland Sheepdogs, and Australian Shepherds, carry a genetic mutation that increases sensitivity to certain drugs, which can lead to severe side effects from specific parasite preventatives (such as high-dose ivermectin). If you own one of these breeds, be sure to inform your veterinarian of your dog’s breed before prescribing any parasite preventative for the first time, and consider genetic testing if recommended. While standard preventive doses are generally safe, individual variations exist.

Why Daily Brushing and Annual Comprehensive Health Check-ups Are Important

Periodontal disease (periodontitis) is one of the most common health issues in dogs. While exact prevalence rates vary by source, the risk increases with age, so establishing a daily brushing routine starting between 1 and 3 years of age can significantly prevent periodontal disease. Use dog-specific toothpaste (human toothpaste is strictly prohibited) and a soft-bristled toothbrush to brush for 1–2 minutes daily. An annual comprehensive checkup includes a physical examination, blood tests, urinalysis, and cardiac auscultation as standard components. We recommend annual checkups even if your dog shows no symptoms, as early treatment upon detecting any abnormalities leads to significantly better outcomes and lower costs.

A pet owner brushing their adult dog’s teeth with a dog-specific toothbrush

Reviewed by a veterinarian

Dr. Tony — Punnawat Phongkittirak

Veterinarian

A veterinarian who majored in veterinary medicine at Khon Kaen University, Thailand, and completed the IVSA program at North Carolina State University in the United States. Drawing on clinical experience at animal hospitals, he works in the pet healthcare field and is dedicated to building a digital care environment that connects pet parents with veterinarians.

Frequently Asked Questions

Do adult dogs really need to take nutritional supplements?

If your pet is already eating a complete and balanced diet, supplements aren’t strictly necessary. However, for breeds prone to joint issues (such as Dachshunds and Corgis), you may consider adding omega-3 fatty acids or glucosamine supplements. We recommend consulting with your veterinarian before introducing any new supplements.

How should I adjust the diet of a neutered adult dog?

After neutering, your pet’s daily energy needs decrease, so feeding the same amount as before can easily lead to weight gain. Consider slightly reducing portion sizes or switching to a formula specifically designed for neutered pets. Monitor your pet’s weight and body condition score (BCS) once a week, and adjust accordingly. The ideal feeding amount varies depending on activity level, so use the recommended feeding guide on the food packaging as a starting point and tailor it to your pet’s individual needs.

What tests should be included in a health checkup?

The basics include a physical exam, blood tests (CBC and serum chemistry), urinalysis, fecal exam, and cardiac auscultation. After age three, we also recommend adding a chest X-ray and an echocardiogram. If your pet’s breed is prone to certain conditions, be sure to include any relevant tests as well.

How can I make up for exercise if my dog can’t go for a walk today?

Indoor play can help meet some of their exercise needs. Nose work, tug-of-war, stair climbing (if joint health allows), and hide-and-seek are all great options. However, if your dog goes more than two days without a walk, it may lead to stress and separation anxiety, so we recommend at least five outdoor walks per week.

How do you determine if an adult dog is overweight?

On the 9-point Body Condition Score (BCS) scale, a score of 4 to 5 is considered ideal. Your pet is at a healthy weight if their ribs aren’t visible but can be easily felt with your hands, and if a waistline is visible when viewed from above. If the ribs are difficult to feel or the waistline disappears, this indicates the early stages of obesity.

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References

[1] Ettinger SJ, Feldman EC, Cote E, Textbook of Veterinary Internal Medicine, 8th Edition - Chapter: Preventive Health Care of Adult Dogs, 2017

[2] AAHA Canine Life Stage Guidelines, Journal of the American Animal Hospital Association, 2019

[3] Nutrient Requirements of Dogs and Cats, 미국국립연구위원회, 2006

[4] WSAVA Global Nutrition Guidelines, World Small Animal Veterinary Association, 2021

[5] AAHA/AVMA Canine Preventive Healthcare Guidelines, 2011