09/29/2025
X-ray, CT, or MRI? Why “all clear” doesn’t always mean all clear!
As a licensed Dynamic Dog Practitioner, part of my work is helping families connect the dots between behavior, posture, and underlying medical issues. One question I hear often is:
“My dog had all the scans, and everything came back fine, so why are they still struggling?”
The truth is, not all scans are created equal:
🔹 X-ray – Uses ionizing radiation to create a 2D image. Best for looking at bones, fractures, arthritis, hip dysplasia, or changes in organ size/shape.
Limitations: Cannot show fine details of soft tissues (nerves, spinal cord, ligaments, early disc changes). Overlapping structures can also hide issues.
🔹 CT scan – Also uses X-rays, but in a rotating, cross-sectional way. Produces a 3D reconstruction of the body, giving a much clearer look at bone structures, nasal passages, chest, or complex joints.
Better than plain X-rays for identifying small bone fragments, tumors, or subtle fractures.
Limitations: Still not ideal for soft tissue like the spinal cord, nerves, or subtle disc issues.
🔹 MRI – Uses a powerful magnetic field and radio waves, not radiation. Gold standard for soft tissues: brain, spinal cord, discs, ligaments, muscles, and nerves.
It can reveal problems invisible to X-ray or CT, such as intervertebral disc disease, spinal cord compression, inflammation, or brain lesions.
Advanced forms, like Dynamic MRI, can show issues that only appear under certain conditions. Certain conditions can be “occult” on standard MRI, but show up with positioning or contrast differences.
Each tool has its strengths and weaknesses.
If the wrong imaging type is used, or if a condition only shows up under specific circumstances, the report may look normal even when a problem is there.
So when a report says “all clear,” it doesn’t always mean nothing is wrong. It means nothing was found with that tool, in that way, at that time.
Has your dog ever had “normal” test results, but you knew something deeper was going on? Share your story in the comments, I’d love to hear it.