Mobility is not just bone and joint
We often assess mobility through bones and joints.
Radiographs, joint effusion, range of motion, cranial drawer tests — palpating, manipulating, trying to localise pain.
But sometimes, mobility is more than just an orthopedic problem.
Owners often say:
“My dog is not quite right.”
“She’s slowing down at the back. So unusual”
“He doesn’t look painful, but something is off.”
“He walks okay, but sometimes just stops and stands.”
Yet in hospital, the dog may not look dramatically abnormal.
Maybe some mild back pain.
Maybe subtle discomfort.
But not enough to explain what the owner is seeing at home.
When that mismatch happens, I’ve learned to pause and ask:
What is this dog actually trying to tell us?
In several cases I’ve seen, joints were not the primary problem.
Blood work and systemic investigation revealed the real drivers of impaired mobility.
Here are three patterns that changed how I approach these “grey-zone” mobility cases.
Hypothyroidism: when treating the thyroid improves mobility
These dogs did not present with dramatic lameness.
Owners described vague slowing down, stiffness, or reduced willingness to move.
Orthopedic examination was often underwhelming.
Screening blood work showed low total T4.
After confirming true hypothyroidism with free T4 testing, thyroid supplementation was started — and mobility improved noticeably over time.
What initially looked like a musculoskeletal problem was, in reality, a systemic endocrine condition affecting energy levels, muscle function, and overall movement quality.
Even in dogs with mild IVDD or osteoarthritis, the clinical decline the owner noticed was not progression of joint disease, but a hormonal issue driving functional decline.
Clinical take-home:
• Confirm low total T4 with free T4 before diagnosing hypothyroidism
• Improvement in mobility after treatment is clinically meaningful
Myopathy: when infection affects how the dog moves
In some dogs, mobility decline was driven by muscle disease rather than joint pathology.
These dogs showed:
• slowing down
• reluctance to jump
• generalised weakness
• and in some cases, ataxia
Joint examination and radiographs were often not explanatory.
Sometimes there were concurrent findings such as mild stifle thickening or hip dysplasia.
In some cases, gait even resembled T3–L3 myelopathy.
Blood work revealed elevated muscle enzymes (e.g. CK, AST, ALT).
And if CK or AST are not part of your routine panel, an isolated ALT elevation may raise questions:
“Is this liver disease?”“Is this NSAID-related?”
When CK, AST, and ALT are increased together, further investigation is warranted.
In these cases, infectious myositis (e.g. Neospora or Toxoplasma based on titres) was identified.
After appropriate antimicrobial treatment, mobility improved significantly.
These cases were a strong reminder that not all “lameness” originates from joints —and that infectious myopathies can present primarily as gait abnormality or ataxia.
Clinical take-home:
• Consider Neospora/Toxoplasma in dogs with weakness, elevated CK, unexplained mobility decline, or ataxia
• Don’t anchor on joints when muscles may be the primary driver
IMPA: when normal temperature and CRP don’t rule it out
IMPA is often thought of as an obvious, painful polyarthritis — egg-shell walking, severe multi-limb discomfort.
But some dogs present much more subtly.
Yes, when temperature is elevated and joints are clearly effusive, IMPA is high on the list.
But in some cases:
• body temperature was normal
• palpable joint effusion was minimal or absent
• CRP was within normal limits
Despite this, joint taps were diagnostic — suppurative inflammation.
These cases may be primary (idiopathic) or secondary to infection or neoplasia.
Owners described these dogs as “just not moving right” or having good days and bad days.
Without joint aspiration, the diagnosis could easily have been missed.
Clinical take-home:
• Normal temperature, minimal effusion, and normal CRP do not exclude IMPA
• Joint aspiration may be required to confirm the diagnosis
Listening to the dog, not just the joints
Across all three patterns, the same lesson stood out:
The owner’s story often mattered more than what the joints looked like on exam or X-ray.
When mobility decline doesn’t fit neatly into an orthopedic box, it’s often a clue to look systemic, muscular, metabolic, or immune-mediated.
Mobility is not just bone and joint.
Sometimes, the joint is the innocent bystander.
Final take-home
If the dog is “not quite right,”but joints and radiographs don’t explain the problem:
• Confirm endocrine disease properly
• Consider muscle pathology and infectious myositis
• Don’t rule out IMPA just because temperature, CRP, or effusion look normal
Mobility is a whole-body problem.
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