My 12yr old sheltie has grown lazy but what concerns me is that her hind quarters shake. This happens whether she is standing or lying down. I doesn't seem to bother her, she has no problem walking or even running when the urge finds its way there. She isn't tender to the touch, she just shakes. Should I be overly concerned or just keep an eye on her.
I would have her checked by the vet. She may have osteoarthritis which can be helped with anti-inflammatories. Your vet will be able to help with a diagnosis after an exam. good luck, vetcare