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Hi, Welcome to Just Answer. You're through to Dr Chris, a Vet based in the UK. I am reviewing your question and will get back to you shortly.
Sorry to hear this. Has an xray of the leg been suggested? Do there seem to be any neurological deficits with the leg (stumbling, dragging, lack of use etc?)
I would recommend an xray initially to help rule out bone changes such as arthritis, however I would worry about either a brachial plexus lesion or a nerve root tumour - an Mri would be needed to diagnose this, so referral to a veterinary neurologist would be the next step if an xray was negative.
Please let me know if you need help locating a referal centre near you, or if you need any further help or advice.
There would be very limited treatment options for a nerve tumour, but increased pain relief (an anti inflammatory and gabapentin for example),would be indicated.