Development and preliminary validity and reliability of the montreal instrument for cat arthritis testing, for use by caretaker/owner, MI-CAT(C), via a randomised clinical trial

•A pain scale (MI-CAT(C)) was developed for owners of osteoarthritic cats.•It was used with locomotor activity monitoring to assess meloxicam-treated OA cats.•Total scale intra-rater reliability, based on the primary owner, was excellent.•Scores fell with meloxicam and with higher locomotor activity...

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