My 16yo Rat Terrier has recently been limping but only on some surfaces. She is ok on hard sidewalks but limps on asphalt.

We were recently in PA with chilly weather 65 down to 30. Weather didnt seem to matter.

Her feet pads look fine, nails are a bit long but not excessive. Shes on meds for arthritis.

Also weird- the limp seems to vary although it stays in her hind end.

Any ideas?

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