Dogs: What to Test, at Which Stage, and What to Skip
Quick Answer — Dogs are tested for four reasons: to confirm an infection that requires isolation, to grade inflammation and follow its response, to answer a time-critical breeding or cardiac question, and to monitor a disease already diagnosed. Anything outside those four is usually a test whose result will not change what happens to the dog.
Quick Answer
A test earns its place by changing a decision. If the result will not change treatment, isolation, discharge or breeding timing, it is a cost with a number attached.
By life stage
Puppies (0–12 months) — the questions are infectious disease and immunity, not chronic disease. Parvovirus and distemper antigen when clinical signs appear; antibody testing is confounded by maternal antibody and by vaccination, which is why antigen is the diagnostic anchor.
Adults (1–7 years) — most testing here is driven by a clinical episode: vomiting, diarrhoea, pyrexia, weight loss, or a breeding decision. Inflammatory markers support triage and, more importantly, monitoring. Pancreatic lipase resolves the ambiguous pancreatitis case. Progesterone and relaxin, in that order, answer two different breeding questions.
Seniors (7+ years) — the questions become chronic: renal function, cardiac load, endocrine disease, and low-grade inflammation. Testing shifts from diagnosis to monitoring, which means the same markers on the same platform over time matter more than any single panel.
The high-value tests, by decision
| Decision | Test |
|---|---|
| Isolate or not | Parvovirus antigen, distemper antigen |
| Treat intensively or send home | Inflammatory markers (CRP), pancreatic lipase |
| Breed today or in 48 hours | Progesterone series |
| Is she pregnant or pseudopregnant | Relaxin |
| Cardiac or respiratory cause of dyspnoea | NT-proBNP |
| Is the treatment working | Serial CRP, serial cPL |
| Is this hypothyroidism or illness | T4 with TSH, never T4 alone |
The last row is deliberately phrased as a pair. A single low T4 is the most common route to a lifelong prescription in a dog that never needed one.
What to skip
- Broad panels in asymptomatic young dogs. Low yield, incidental findings.
- Antibody testing to diagnose acute infection. Vaccination confounds it.
- A single cortisol to diagnose Cushing’s. Dynamic testing is required.
- Screening echocardiography substitutes. A biomarker does not exclude structural disease.
Where the menu ends
Data pending. This section reports measured values from internal validation studies. They are published once the supporting study is complete; the current report is available from technical support on request.
Six traps
- Testing without a decision attached. The most common waste.
- Diagnosing on one abnormal value. Most markers require context.
- Ignoring the vaccination history. Changes antibody interpretation completely.
- Switching platforms mid-monitoring. Bias mimics clinical change.
- Using a canine marker in a cat (or vice versa). Species-specific antibodies and intervals.
- Repeating the same test without a changed clinical picture. A second number rarely resolves an ambiguous first.
The Author’s Take
Position. A species hub should be built around decisions, not around a menu list, and it should be willing to say “do not test” more often than vendors usually do.
Reasoning. Clinics do not wake up wanting a panel; they wake up with a puppy that has bloody diarrhoea or a bitch that must be bred this week. Organising a species page around those moments makes the relevant assay obvious and makes the irrelevant ones visibly irrelevant, which is a service to the buyer and a defence for the vendor. It also reduces the most common source of dissatisfaction in this category: a test was run, the number came back, nobody knew what to do with it, and the assay took the blame.
Disclosure. Clinical decision guidance, not a performance claim. Figures marked indicate where platform data and menu coverage must be inserted.
Related pages
- Puppies · Seniors · Cats
- Infectious disease index · Inflammatory · Endocrine · Cardiac · Renal
Sources
- Reference to be added.
- Reference to be added.
- CLSI EP28-A3c — species- and age-specific reference intervals.
Frequently asked questions
- What should a healthy adult dog be tested for routinely?
- Very little, if there is no clinical question. Routine panels in asymptomatic adults have low yield and generate incidental findings that lead to further investigation. The defensible approach is to test when a decision depends on the result — a sick animal, a pre-breeding assessment, or a monitoring plan already in place.
- Is a pre-anaesthetic panel worth it?
- For young healthy animals undergoing routine procedures, yield is low. For older animals, animals with known disease, or procedures with significant risk, targeted testing — renal, hepatic, cardiac — is more useful than a broad panel whose results will not change the anaesthetic plan.
- Which dog tests have the highest decision value?
- Those that change treatment, isolation or discharge on the same day: parvovirus antigen in a suspect puppy, inflammatory markers when sepsis is suspected, progesterone when breeding timing is the question, and cardiac markers in a dyspnoeic patient.