Quote Originally Posted by Catlady711
I agree with two additions.

Drinking lots of water can also be diabetes. The blood work should show if that or the kidneys is the problem.

Regarding the limping - Not only could this be an ACL injury but I've heard of similar things happening with a leg out of joint. I can't think of the proper wording for it but there is a ligament that is supposed to rest inside a dished out area in the joint, and sometimes that can pop out of place causing limping and pain. If the animal can work it back in the limping would go away. Wished I knew the technical wording for it but that's the best I can do. I don't believe stuff like that shows on x-rays but only by feeling and manipulating the leg joint.

I agree that first priority should be to address the water hogging as that can be far more serious than the limping.

Keep us posted.
Luxating patella? Lucky has mild luxating patellas in his rear, and that's what I thought of too when I first read the original post. However, since she suggested that the kidney troubles and the limp were related, I wasn't sure if I should mention it.