What it is
Every movement starts with a signal from the spinal cord. Motor neurons there send long fibres out to the muscles, and their steady messages keep the muscles both working and healthy. In spinal muscle atrophy, an inherited fault makes these neurons wither and die off one by one. Muscles that lose their nerve supply weaken and shrink, starting with those that hold the body up.
The disease shows itself early, while the dog is still young, and progresses over time. The senses are not affected, so the dog stays alert and interested in its surroundings even as its strength fades.
Everyday life adjusts to what the muscles can manage: short, gentle outings instead of long walks, non-slip floors, and a helping hand on stairs or getting into the car. Watching how your dog stands, sits and rises from its bed shows you how its strength is changing.
Signs you may notice
- Tires quickly
- Unsteady, short-stepped walk
- Weak hind legs
- Thin, wasted muscles
- Odd way of standing or sitting
- Struggles to get up
You may notice a puppy tiring quickly, walking unsteadily or with short steps, weakening in the hind legs, and muscles that look wasted. Some puppies stand or sit in an unusual posture because holding their body up is hard.
When to see a vet
Book a vet visit if a young dog tires quickly, walks unsteadily or seems to be losing muscle. If your dog struggles to breathe or swallow, a vet is needed immediately.
This is general information, not veterinary advice. For your own dog's health, tests and treatment, see a vet.