Senior dog wellness screening: what the tests actually find

Quick answer

Lifting the lip takes three seconds. Dental disease is the most common finding in a senior screen, and it is one of the few that owners can see for themselves.

A senior wellness screen is not a general check-up with more steps. It is a deliberate search for a short list of diseases that are silent while they are still treatable and obvious only once they are not.

Half of its value comes from the clinic. The other half comes from numbers you collect at home in the weeks before the appointment, because a single snapshot at the vet cannot show a trend, and trends are what senior medicine runs on.

• Screening works because dogs have large functional reserve and hide decline until the reserve is gone.
• Urine tells you about the kidneys earlier than blood does, so a blood panel alone is not a kidney screen.
• Blood pressure is silent, damaging and frequently skipped.
• Weight alone is not enough: muscle condition and body condition are different measurements and can move in opposite directions.
• The most useful home number for most senior dogs is the sleeping breathing rate.

Decide in 60 seconds

Why screening works on an animal that hides decline

Dogs have large functional reserve in most organs. That is a survival feature, and it is exactly what makes senior disease hard to catch.

Kidneys.

A substantial majority of kidney function has to be lost before the standard blood markers rise above the reference range. Before that point, the earliest measurable change is the kidney's ability to concentrate urine. This is why a urine sample is not an optional extra on a senior panel: a normal blood result with dilute urine is a meaningful finding, and blood alone would have called that dog healthy.

Liver.

The liver has enormous reserve and regenerative capacity, so liver enzymes often rise before function fails. A raised enzyme in a well dog is a reason to look, not a diagnosis, and interpreting it is about which enzymes, by how much, and in which direction over time.

Heart.

Dogs compensate for failing heart function by increasing heart rate and retaining fluid, and they do this efficiently for a long time. The compensation is invisible until it fails, at which point fluid accumulates in the lungs. The rate at which a dog breathes while genuinely asleep rises before coughing or breathlessness appear, which is why it is the home number worth tracking.

Musculoskeletal.

A dog with a painful joint shifts weight to the other limbs and shortens its stride rather than limping. Owners see a dog that is "slower", not a dog that is lame. Muscle loss then follows on the painful side, which is measurable long before the dog stops using the leg.

Behaviour.

Prey species hide illness; dogs hide pain differently, by carrying on. A dog will keep greeting people, keep eating and keep going to the door with a level of osteoarthritis that would put a person on the sofa.

When "senior" starts, and why size decides it

There is no single age. Large and giant breeds age faster and become senior years earlier than small breeds, and many practices use a default of around seven while adjusting it up for small dogs and down for giants.

A more useful way to think about it is the last quarter of expected lifespan for that size and breed. A Great Dane is in senior territory long before a Chihuahua of the same age.

Start screening while the dog still looks completely well. The first screen's main job is to produce a set of normal values for that individual, so that the next one can be compared against them rather than against a population range.

What a senior screen actually contains

History, taken properly.

The highest-yield part of the whole appointment, and the part most often rushed. Expect questions about appetite, thirst, urination frequency and volume, toileting accidents, stiffness on rising, exercise tolerance, coughing, night-time restlessness, disorientation, and any change in interaction with the household.

Weight, body condition and muscle condition.

Three different measurements. Weight is a number. Body condition scores fat cover. Muscle condition scores muscle mass over the skull, shoulder blades, spine and pelvis.

They can move in opposite directions. A dog with a chronic illness can lose muscle while gaining fat, keeping its weight stable and looking unchanged in photographs. Muscle loss over the top of the head and along the spine is one of the earliest physical findings in several senior diseases.

Full physical examination.

Mouth and teeth, including under the lip at the back where most disease sits. Eyes, including a look at the lens and the back of the eye. Lymph nodes at five sites. Abdominal palpation for organ size and masses. Heart auscultation for murmurs and rhythm. Chest auscultation for lung sounds. Joints moved through range. Skin examined and every lump mapped with a measurement, so the next visit can compare.

Blood pressure.

Often skipped, and it should not be. Hypertension in dogs is usually secondary to another disease, most often kidney disease or an endocrine disorder, and it damages the eyes, kidneys and brain silently. Sudden blindness from retinal detachment is a preventable presentation.

Haematology.

Red cells, white cells and platelets. Anaemia, inflammation, and some cancers show here first.

Biochemistry.

Kidney values, liver enzymes, protein, glucose, calcium and electrolytes. Raised calcium in an older dog is a finding that always needs following up, because it is associated with several cancers.

Urinalysis, including specific gravity.

The part most often left out and the part that carries the earliest kidney information. It also detects protein loss, glucose, blood, crystals and infection. First-morning urine is the most informative sample because it is the most concentrated.

If protein is present, expect a urine protein to creatinine ratio, which quantifies it.

Thyroid.

Hypothyroidism in dogs is common, easy to treat and easy to miss, because its signs are lethargy, weight gain, skin and coat changes and heat-seeking, all of which read as ageing.

Region-appropriate infectious disease testing.

This is where advice from one country stops applying to another. Heartworm, tick-borne diseases such as ehrlichiosis, anaplasmosis and babesiosis, and leishmaniasis in parts of southern Europe and elsewhere are all relevant in some regions and irrelevant in others. Tell your vet where the dog has lived and travelled, including holidays, because vector-borne disease can appear years after exposure.

Imaging, when indicated.

Chest radiographs for heart size, lung fields and metastasis screening. Abdominal imaging for organ size and masses. Echocardiography if a murmur or arrhythmia is found. These are not automatic in every screen, but they are the natural next step from specific findings.

The home baseline that makes a screen worth doing

Weighing food and measuring water turns "he seems to be drinking a lot" into a number your vet can act on.

Sleeping breathing rate.

Count breaths for a set period while the dog is genuinely asleep, not dozing and not panting, and do it in a cool room. Record it a few times a week. What matters is your dog's own baseline and any upward trend away from it. Ask your vet for the threshold they want you to call about, because it is personalised to the dog.

Water intake.

Measure what goes into the bowl and what is left after twenty four hours, on a day when the dog has no other water source. Do this for two or three days. A change in thirst is one of the most informative single findings in senior medicine, and "he seems thirstier" is not something a vet can act on.

Weight, monthly, on the same scale.

Most veterinary practices will let you use the waiting room scales without an appointment. A slow downward drift across several months is far more significant than any single reading.

Food actually eaten, weighed.

Not the amount put down. Weighing the bowl before and after removes the guesswork, and it distinguishes a dog that is eating less from a dog that is eating the same but losing weight, which point in different directions.

A lump map.

Draw a rough outline of the dog and mark every lump with a date and a measurement. Photograph each one beside a coin or a ruler. This turns "I think it might be bigger" into evidence.

Video.

Film the dog getting up from lying, walking away from the camera, and going up and down stairs. Gait changes are far easier to see on video than to describe, and they are easier for the vet to assess than a dog that has just been driven to the clinic and is running on adrenaline.

Toileting and night-time behaviour.

Note accidents, straining, frequency, and any pacing, panting or vocalising at night. Night-time restlessness in an older dog has several possible causes, and separating pain from cognitive change from a full bladder starts with a written record.

Changes that mean act today rather than waiting for the annual screen

Sleeping breathing rate climbing over several days. Fluid on the lungs. Do not wait.

A sudden increase in thirst and urination. Kidney disease, diabetes, an endocrine disorder or a uterine infection in an unspayed female. All benefit from being caught within days.

Weight loss with a normal appetite. Narrows the possibilities considerably and none of them improve with time.

A mass that changes. Speed of change is one of the most useful features. A needle sample is quick, usually well tolerated, and often answers the question in one visit.

Pale, white or yellow gums. Anaemia or liver disease. Same-day.

A distended, tight abdomen, especially with unproductive retching. Bloat is an emergency in any dog, and deep-chested breeds are at highest risk.

Sudden blindness or bumping into furniture. Frequently linked to hypertension and often reversible if treated quickly.

Collapse, weakness or an inability to rise. Emergency.

The routine that catches problems early

A dog that accepts a toothbrush accepts having its mouth opened. The handling is the point as much as the brushing.

What never to do

Do not decline the urine test to save money on a blood panel.

If budget forces a choice, discuss it openly with your vet. Urine specific gravity is one of the cheapest and highest-yield tests on the list, and dropping it removes the earliest kidney information from the screen entirely.

Do not treat a single abnormal number as a diagnosis.

Mildly raised liver enzymes in a well dog, a slightly low thyroid result during another illness, and a marginally raised kidney value in a dehydrated dog are all common and often mean nothing on their own. The correct response is usually to repeat the test and look at direction of travel, not to start treatment.

Do not give supplements or over-the-counter pain relief before the screen.

Human anti-inflammatory drugs are toxic to dogs, and some supplements alter blood results. Anything you have given should be written down and mentioned.

Do not skip the dental assessment because of anaesthetic worry.

Untreated dental disease is painful, chronic and a continuous source of infection. Anaesthetic risk in an older dog is managed by screening bloods, blood pressure, appropriate protocols and monitoring, not by avoidance. Discuss the specific risk for your dog rather than deciding in advance.

Do not compare your dog's results to a friend's dog.

Reference ranges are population averages. Individual baselines are what matter, and some breeds sit outside the general range while being entirely normal.

Variation that changes the answer

By size. Giant breeds should start screening years earlier than small breeds. They also carry different risks: bone tumours and cardiac disease feature more heavily, while small breeds skew towards dental disease, mitral valve disease and tracheal collapse.

By breed. Dobermanns and several other large breeds carry a well-recognised risk of dilated cardiomyopathy, which is why cardiac screening is recommended earlier and more often in those lines. Cavalier King Charles Spaniels develop mitral valve disease at high rates and young ages. Boxers and several other breeds have elevated cancer risk. Brachycephalic breeds need airway and anaesthetic planning built into any procedure. Ask specifically what your breed's screen should include.

Sighthounds are a laboratory trap. Greyhounds and related breeds naturally run with a higher packed cell volume, lower white cell and platelet counts, higher creatinine and lower thyroid hormone than the general canine reference ranges. A greyhound assessed against a standard range can be diagnosed with hypothyroidism or kidney disease it does not have. Say the breed out loud when discussing results.

By sex and neuter status. An unspayed older female with increased thirst, lethargy or any vulval discharge needs a uterine infection excluded urgently. Neutered dogs of both sexes have a different cancer and joint disease profile from entire dogs.

By region. Which parasites and vector-borne diseases belong on the screen is entirely local. So is drug availability: the specific anti-inflammatory, blood pressure or heart medication routinely used in one country may not be licensed in another, so ask about what is available where you are rather than what an article recommends.

By previous travel. Some vector-borne infections have long latent periods. A dog that spent one summer abroad years ago is still relevant history.

What the vet will ask for

The same tolerance that allows home brushing lets a vet examine the mouth thoroughly without sedation, which is how early dental disease is caught.

Bring these and the appointment becomes a screen rather than a conversation:

• Monthly weights for as far back as you have them
• Measured twenty four hour water intake
• Sleeping breathing rate readings
• A first-morning urine sample, kept cool
• The lump map with dates and measurements
• Video of the dog rising, walking and on stairs
• A written list of every medication, supplement and treat, including anything given by other household members
• Travel history, including holidays years ago
• A short note on what has changed at home, since environment and routine changes affect behaviour and appetite

Ask, before you leave, what the plan is for the next screen: which tests, at what interval, and which single number you should be watching at home between now and then. That last question turns a screen into monitoring.

When to get help

Contact your vet the same day for any of these:

• Sleeping breathing rate rising over several days, or any breathing difficulty
• Sudden marked increase in thirst or urination
• Pale, white or yellow gums
• A distended abdomen, particularly with unproductive retching
• Sudden vision loss or disorientation
• Collapse, weakness, or inability to stand
• Any discharge from the vulva in an unspayed female

Book within a week for:

• Weight loss with a normal appetite
• A lump that has changed
• New stiffness, reluctance on stairs, or a change in exercise tolerance
• Night-time restlessness, pacing or vocalising
• Bad breath, dropping food, or chewing on one side

Book on schedule, with nothing wrong at all, for the screen itself. The whole value of screening lies in doing it while the dog still looks well, because that is when the results are still a baseline rather than a diagnosis.