Take him in and get him checked out. My guy has been going days off and on holding up his left front and limping around. At first the vet thought it was a sprain because it started after he did a flying leap off the couch to tackle my adult female and she dodged him last minute. he hit the floor pretty hard and was limping after that. But he's back to babying that leg so he goes in for xrays on the first... though when the vet checked his leg and applied pressure on the leg bones, he wasn't thrilled so we're 95% sure its pano. The xrays will tell us if it is or if something else is going on.
Get him checked that way you can at least help ease the pain. Thing I've learned with pano is it can be sudden and you'll notice or it can be aggravated and that's when you notice a problem. With Dax the first time, it only started after he did something dopey. this time he didn't do anything.
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Shasta GSD 5/5/10 CGC, ITD, TC
"Dax" Thor z vom Weberhaus CAX, CGC, ETD, HCT, RATI, RATN, TC 3/18/2013
Zena GSD 6/1/03
Riley GSD/BC 1/10/05-2/1/2013