I think its hip trouble.

It can't hurt to get the spine x-rayed. My dog never let us know when she was in pain. She never cried or really showed it at all. Dogs are tough. BUt if you think something is wrong I think you should get it checked out. I found that by the time they show symptoms things are pretty bad for them.

Sounds like a spine problem to me as well. A good physical exam would be enough to confirm location of spinal lesion, although not necessarily the cause of the lesion. Sometimes radiographs are good enough for that, but if he had a disk problem and you wanted him to have surgery, MRI or CT is better. If surgery isn't in his near future, medical management and cage rest can get him over the hump sometimes. My K'Ehleyr has terrible spine problems, and when she has bad days she stands and walks as you describe. She had an MRI because I was willing to have surgery for her, but the neurologists said that so many disks were messed up that they didn't know which one(s) were causing the problems and which ones to fix. So she is on many medications and getting acupuncture, which helps a lot.

Corgis have unnaturally long spines and tiny legs, so yup I'd look into hips and spine.

Purebred dogs in gen have more problems then mutts because of signal trait breeding..

I would have your pup's spine X-Rayed. I used to have mini Dachshunds - my 2 special guys developing worst case neck and back disc disease. Wasn't a problem to know which discs to operate on because every single one was causing a problem. You would need to see a neuro. Really hope this is not your dog's problem. In the event your dog starts to scream in pain due to pressure on spinal nerves try to pick up in a blanket to get to vet. Hope all goes well.

Look carefully, it could be he is sticking his claws out for better traction, if so, it just means he is uncomfortable on those surfaces and is trying to get a better grip, which is impossible on smooth surfaces. My dog does this everytime he is on a smooth surface.

My Casey was recently diagnosed with arthritis, and the only sign he gave was going after his sister in a resource-guarding rage. Then he stopped playing with his brother, with whom he used to wrestle and chase. Now he is on Derramax and a glucosamine and chondroitin supplement. We keep a better eye on him and no longer let him wander free and it has cut down on his raging at Bina.

I put rubber-backed rugs around where Casey sits on the smooth vinyl flooring so that he is more comfortable. Smooth flooring makes the feet slide out from under them, sepecially when they try to sit. Casey appreciates the rugs and goes to them right away.

mazer, i only notice this behavior when simon is on linoleum or on the wooden deck. it does look like he is simply "sliding" when he's on smooth surfaces.

i have pretty much covered my kitchen floor with rugs, for his comfort. :)

thanks for everybody's input. i do think i will go ahead and have his spine x-rayed just to rule out anything physical.