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I am sorry to hear your greyhound is struggling like this. Has the gabapentin and metacam helped?
An arched back can indicate back pain from things that do not show up on Xrays, such as pinched nerve roots and bulging interverterbral discs. Some times steroids and muscle relaxants are needed in these cases if nonsteroidals like metacam do not help.
Did she have a fever? Is she spayed?
Have any blood tests been done? There are infections and tick borne diseases that could cause these symptoms. If she has a fever (103 or higher), or an elevated white blood cell count, I might try antibiotics such as doxycycline and/or clindamycin.
Are her gums pink or pale in color?