Thank you for your question regarding your girl Coco. It sounds like she has done pretty well considering her spinal surgery 4 years ago! It is quite possible this ongoing leg jerking cannot be helped, however you could definitely consider a couple of different therapies that may potentially help limit the frequency of this jerking.
It sounds like you have already tried laser therapy, and you could certainly continue you with this, if you feel it seems to be assisting your girl and/or lowering the frequency of her leg jerks.
The other therapy that may help your girl's leg jerking potentially is veterinary acupuncture. There is some good evidence for this available, and many vets have been using and recommending acupuncture for their spinal disease/surgery patients. You can read more about the use of acupuncture for these patients online here: http://www.dodgerslist.com/literature/healingpage.htm . If you need help finding a veterinary acupuncturist in your state, just let me know and I will assist you in this search.
I do think it is unlikely that this leg jerk will ever completely resolve, but it is possible that the frequency of these jerks could certainly be lowered with the assistance from some acupuncture. Also discuss this with your vet and assess Coco's muscles
in her hind legs. If she could put more muscle on, then you could consider hydrotherapy or physiotherapy for your girl as well.
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