Saint Bernard Age Calculator
Calculate your Saint Bernard’s age in human years and get personalised health, nutrition, and life stage information.
Saint Bernard Health Conditions#
Hip Dysplasia
seriousVery CommonAbnormal hip joint development causing malformation of the ball-and-socket joint, leading to progressive arthritis, pain, and mobility loss. Saint Bernards have one of the highest rates of hip dysplasia among all breeds, with studies showing over 45% of Saints evaluated by OFA having some degree of dysplasia. The combination of rapid growth, extreme body weight, and genetic predisposition makes this the breed's most prevalent orthopedic condition.
Prevention: Source puppies from breeders who perform OFA or PennHIP evaluations on all breeding stock. Feed a giant-breed puppy formula to moderate growth rate — this is the single most important environmental intervention. Never supplement calcium in giant-breed puppies. Avoid all high-impact exercise during the first 24 months. Maintain a lean body condition throughout life — every excess pound multiplies force on dysplastic hips. Begin joint supplements early.
Symptoms: bunny-hopping gait, difficulty rising, especially from hard surfaces, reluctance to climb stairs or jump into vehicles, noticeable hindquarter muscle wasting, audible joint clicking, pain when hips are manipulated
Entropion and Ectropion
moderateVery CommonEntropion is an inward rolling of the eyelid causing the lashes to rub against the cornea, while ectropion is an outward sagging of the lower eyelid exposing the conjunctiva. Many Saint Bernards have a combination of both conditions — ectropion centrally with entropion at the corners (a condition called 'diamond eye'). The breed's heavy facial skin, loose jowls, and deep-set eyes make eyelid abnormalities extremely common and often require surgical correction.
Prevention: Eyelid abnormalities are largely genetic and structural, making prevention difficult. Select puppies from breeders who screen for eyelid conformation. Have your veterinarian assess eyelid position at every puppy visit. Surgical correction is often necessary and may need to be performed in stages as the puppy's head continues to grow. Waiting until the head reaches full maturity (around 12-18 months) for definitive surgery is ideal, though temporary tacking may be needed earlier to protect the cornea.
Symptoms: excessive tearing or discharge, squinting or keeping one eye partially closed, redness and irritation of the conjunctiva, corneal ulceration from lash contact, rubbing eyes on furniture, chronic conjunctivitis
Gastric Dilatation-Volvulus (Bloat/GDV)
life_threateningVery CommonA life-threatening emergency where the stomach distends with gas and rotates, cutting off blood supply to the stomach and spleen while compressing major blood vessels. Saint Bernards are among the very highest-risk breeds due to their giant size and deep, broad chest. GDV can progress to fatal cardiovascular shock within 1-2 hours. The breed's enormous body size makes emergency surgery more complex, and recovery can be more difficult than in smaller breeds.
Prevention: Prophylactic gastropexy (stomach tacking) is strongly recommended for all Saint Bernards and should be performed during spay/neuter surgery. This procedure reduces volvulus risk by over 90% and is considered standard of care for giant breeds. Feed two to three smaller meals daily, use a slow-feeder bowl, and enforce strict rest one hour before and after meals. Avoid elevated food bowls. Know the location of the nearest emergency veterinary hospital that can perform GDV surgery, and have a plan for transporting a 150+ lb dog urgently.
Symptoms: distended abdomen that feels tight like a drum, unproductive retching or dry heaving, extreme restlessness, pacing, inability to settle, excessive drooling beyond normal breed levels, rapid heart rate, pale or blue gums, collapse
Dilated Cardiomyopathy (DCM)
life_threateningCommonA disease of the heart muscle where the chambers enlarge and the walls thin, reducing the heart's ability to pump blood effectively. Saint Bernards are genetically predisposed to DCM, which progresses from asymptomatic heart enlargement to congestive heart failure. The condition often develops silently, with no outward signs until the heart is significantly compromised. Regular cardiac screening is the only way to detect early-stage DCM.
Prevention: There is no way to prevent DCM, as it is primarily genetic. Annual cardiac screening with auscultation starting at age 2, and echocardiography starting at age 4, allows early detection. Once detected, medications (pimobendan, ACE inhibitors, diuretics) can slow progression and improve quality of life for months to years. Feed a diet meeting AAFCO standards from an established manufacturer — some grain-free diets have been associated with DCM in certain breeds. Taurine and L-carnitine supplementation may be recommended.
Symptoms: decreased exercise tolerance, coughing (especially at night), rapid breathing at rest, lethargy and weakness, fainting or collapse, distended abdomen from fluid accumulation, loss of appetite
Osteosarcoma (Bone Cancer)
life_threateningCommonAn aggressive malignant bone tumor that primarily affects the long bones of the limbs. Giant breeds are significantly overrepresented, and Saint Bernards are among the most commonly affected. Osteosarcoma is highly metastatic, with microscopic spread to the lungs often present at the time of diagnosis. The disease typically causes sudden, severe lameness and limb pain. Treatment options include amputation with chemotherapy, limb-sparing surgery, or palliative care.
Prevention: There is no known prevention for osteosarcoma. Be vigilant for sudden-onset lameness that does not resolve within 2-3 days, and seek prompt veterinary evaluation including radiographs. Early detection offers the most treatment options. Some studies suggest that delayed spay/neuter may slightly reduce osteosarcoma risk in giant breeds, though the evidence is mixed. Awareness of the disease is the most important tool — any unexplained limb lameness in a Saint Bernard over age 5 warrants imaging.
Symptoms: sudden severe lameness in one limb, swelling or lump on a limb bone, limb pain that worsens rapidly, pathologic fracture (bone breaking through tumor), decreased appetite, lethargy
Saint Bernard Growth Chart#
| Age | Weight Range | Notes |
|---|---|---|
| 2 months | 15–25 lbs | Weaning complete, transitioning to giant-breed puppy food. Growth rate is already remarkable. Puppies are round, fluffy, and deceptively small relative to their eventual adult size. |
| 4 months | 35–55 lbs | Growth rate is explosive — gaining 4-6 lbs per week is normal. Puppies are outgrowing equipment rapidly. Joints are under significant stress; controlled exercise is essential. Teething begins. |
| 6 months | 55–85 lbs | Approximately 40-50% of adult weight but already larger than most adult dogs of other breeds. The body appears gangly and uncoordinated. Panosteitis (growing pains) is common during this period. |
| 9 months | 75–110 lbs | Around 55-65% of adult weight. The massive head and broad chest are becoming prominent. Growth plates are still wide open. The adult coat is developing. |
| 1 year | 90–130 lbs | Approaching 65-75% of adult weight with continued growth in both height and bulk. Still on giant-breed puppy formula. The characteristic jowls and dewlap are developing, increasing drooling. |
| 1.5 years | 100–150 lbs | Approximately 75-85% of adult weight. Height is nearly complete, but the body continues to fill out substantially. Growth plates are beginning to close. Can begin transitioning to adult food. |
| 2 years | 120–180 lbs | Most Saints are near their full adult size, though some males continue to add bulk until age 3. Growth plates are closed or nearly closed. The full adult proportions — massive head, deep chest, and powerful build — are established. |
Healthy adult Saint Bernards are among the heaviest dog breeds, with males typically weighing 140-180 lbs and females 120-140 lbs. Despite their enormous size, Saint Bernards should not be obese — a lean body condition is critical for joint health, cardiac function, and longevity. Assess body condition by feeling the ribs through the thick coat (palpable with moderate pressure) and checking for a waist when viewed from above. The breed should appear massive and powerful, not round or pendulous. Every excess pound shortens the lifespan of a giant breed — maintaining ideal weight is arguably the single most impactful thing an owner can do.
Saint Bernard Life Stages#
puppy
0mo – 6moSaint Bernard puppies are irresistibly adorable, fluffy giants-in-training who grow at a staggering rate — often gaining 3-5 lbs per week. Despite their rapid size increase, they are gentle, sociable puppies who bond deeply with their family from day one. The critical socialization window is important for this breed, as their enormous adult size means any fear or aggression issues become exponentially more difficult to manage. Puppies must learn bite inhibition and gentle mouth habits early, before their jaws reach adult strength. Controlled growth through proper nutrition is essential to protect developing joints.
adolescent
6mo – 1.5yrAdolescent Saint Bernards are in a prolonged, awkward growth phase where their bodies are rapidly approaching massive proportions while their coordination and mental maturity lag behind. They can be clumsy and unaware of their size, accidentally knocking over furniture, children, and adults. Training during this phase requires patience, as they are generally willing but easily distracted and physically awkward. This is when drooling typically increases significantly, and the full adult coat develops. Joint protection during this rapid growth phase is paramount.
young adult
1.5yr – 3yrYoung adult Saint Bernards are still filling out their massive frames — many do not reach their full weight until age 3. They begin to settle into their characteristically calm, gentle temperament while retaining playful moments. Their patient nature with children becomes fully apparent, and they develop the quiet watchfulness that has made them beloved family guardians for centuries. Weight management becomes critical as growth completes, since excess weight on their huge frame accelerates joint deterioration and shortens their already brief lifespan.
adult
3yr – 5yrAdult Saint Bernards are calm, dignified companions who are content with moderate activity and maximum family time. They are remarkably gentle with children and smaller pets, seemingly aware of and careful with their enormous size. Their energy level is low compared to most breeds, and they prefer shorter, unhurried walks to vigorous exercise. Drooling is a constant reality, especially around mealtimes and in warm weather. The breed's short lifespan means that proactive health monitoring during these prime adult years is essential for maximizing quality time.
mature adult
5yr – 6yrMature Saint Bernards enter their senior transition earlier than most breeds due to the accelerated aging that accompanies giant size. Joint stiffness and mobility challenges often become apparent, and the risk of osteosarcoma (bone cancer) increases. Cardiac health should be closely monitored, as dilated cardiomyopathy can develop. Despite their physical decline, mature Saints retain their gentle, loving nature and deep bond with family. Veterinary visits should increase in frequency.
senior
6yr – 8yrSenior Saint Bernards require careful management of their enormous aging bodies. Mobility may be significantly compromised, and assistance with rising, navigating stairs, and getting in/out of vehicles is often necessary. Their weight makes mobility aids and home modifications particularly important — non-slip surfaces, ramps, and supportive harnesses become essential equipment. Despite physical limitations, senior Saints often maintain their sweet, gentle temperament and deep emotional connection with their family.
geriatric
8yr – end of lifeGeriatric Saint Bernards reaching age 8 and beyond have exceeded the breed's median lifespan and need maximum comfort care. Mobility is typically severely limited, and the dog's enormous weight makes physical assistance challenging. Quality of life assessments should be conducted frequently, focusing on pain levels, appetite, enjoyment of family interaction, and ability to perform basic functions. End-of-life planning should be discussed with the veterinarian early, with a focus on maintaining comfort and dignity. Every additional day with a geriatric Saint Bernard is a gift to be cherished.
Dental Milestones#
Saint Bernards have a large mouth with generally well-spaced teeth, making them less prone to the dental crowding issues seen in small breeds. However, their enormous, heavy lips and constant drooling create a uniquely moist oral environment that can promote bacterial growth. The breed's drool often contains food debris that accumulates in the lip folds and along the gumline. Regular brushing helps, but the sheer size of the mouth makes thorough home dental care challenging. Anesthetic dental procedures require experienced veterinary teams comfortable with giant-breed anesthesia, including appropriate drug dosing, IV fluid rates, and post-anesthetic recovery monitoring for a dog that may weigh over 150 lbs.