Beagles can be prone to a problem called exercise intolerance where the muscles get weak suddenly after use.
Ataxia is the loss of the ability to coordinate muscular movement. The diseases below are known in beagles and may be the problem as they can all cause ataxia.
from this page here is a list of the problems
http://clubs.akc.org/NBC/beagle_health_problems.htm#N
"Gangliosidosis (Storage Diseases): Ataxia, head tremors, blindness & generalized seizures involving all 4 limbs may occur. Dogs can become paraplegic or tetraplegic. (H- Recessive, age of onset under 6 months) 1
Global Cell Leukodystrophy (Beta-Galactocerebrosidase Deficiency): The collection of fatty material in brain cells due to lack of an enzyme leads to ataxia. (H-Recessive). age of onset under 5 months. 1
Glycogenosis (Glycogen Storage Disease): A group of disorders caused by deficiencies of an enzyme involved in the degradation of glycogen. Type VII (Phosphofructokinase Deficiency). Clinical signs vary with each disease but generally include progressive muscle weakness, cardiac abnormalities, hemoglobinuria, neurologic signs & death. There is no treatment. (H -Recessive). Age of onset under 12 months. 1
Hound Ataxia: Rear leg ataxia which progresses; forelimbs are not affected. (H- Undetermined mode). Age of onset under 7 years. 1
White Shaker Dog Syndrome: Tremors can occur in all 4 limbs & the head. Hypermetria & swaying may be present. Tremors can be mild to severe & the gait may be ataxic. (H-Undetermined mode). Age of onset under 2 years. "
Your vet should be able to investigate just which problem it is or if it is another issue.
You may need to see a specialist with him to find out the best forms of treatment.
Hope this helps!
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