Thanx for your input. In reply to your questions, I am a Veterinary Nurse.
I have spoken to the vets I work for and every other vet I know socially. I have also taken her to a Veterinary medical specialist, and spoken to a vet surgical specialist about her problems, but nobody has any answers for me. One specialist suggested an EMG to test for abnormal muscle activity, and a few other blood tests.
I don't feel I overwork her. Her exercise consists mostly of daily forest walks, where she runs free, and agility training 3 times a week. In summer I walk up the mountain about 3 times a week with her, where she also runs free. Some mornings I do some obedience training with her.
She has always tired quicker than other dogs and I am very careful with her exercise, although the onset of the condition is almost unavoidable at times. She can become stiff after 5 minutes of exercise if very excited.
She has no muscle cramps or nerve pinches, and we can't find any pain. I've been told that fits usually happen at rest.
I was told by a vet specialist to exercise normally and that if there in some kind of myopathy it will become apparent by the time she turns 4.
She is first and foremost a companion dog and I would not hesitate to retire her if necessary for her well-being. But as yet nobody can give me any advice regarding exercise and treatment.
I would love somebody to take her on as a case study and try to get to the bottom of this, as I am very worried about her.
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