Obviously you should consult with your vet about this since the dog may have a condition that would contra-indicate the administration of this medication.
Usual doses are 0.5 to 2mg/kg every 8 to 12 hours (a kg = 2.2 lbs).
Please-please-please talk to your vet about long term pain relief options.
And thank you so very much for asking about this before just treating (very good choice!).
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Animal Rescue&Care Org Owner; Animal Care author; Animal Behavior Consults.;Cert. Avian Specialist;