I have a 9 year old german shorthair who's been an AWESOME pheasant dog for me (also an awesoem friend). This year she really started to stiffen up after a few hours in the field especially when the weather turned cold. We got her an electric heat pad to go in her insulated dog house. Now she's like a pup again! She might be a little tired toward the end of the day but she doesnt seem to have the stiff joints anymore whatsoever. Just a little suggestion for all you having the same trouble cuz it hurts more to see ur dog in pain than not being able to hunt with her.