Re: Could this be happening so soon?
I just saw this.
I don't know if I told you but when Gala was between 6-8 months this happened to her twice.
I had her checked and it was her knee.
She was limping just a bit afterwards.
She had a slight movement of the knee, but not quite a luxating patella.
After I did some researched I found out that a dachshund's knee doesn't mature until it is between 18-24 months. And in that time you could get a "false possitive" on a luxating patella, that will actually correct itself with time as the dog finishes growing.
So, have you checked Spirit's knees?
Unless the jump was dramatic and there was trauma I do not think it is a disc, but run your hands gently down the spine to see if you find a sore spot.
CERTAINLY crate him until you take him to the vet.
I think odds are it's muscular: he fell incorrectly.
If you have a warm pad that you can do, put a folded towel on the sore area and then the warm pad.
G Rivera and the black dog crew.