Is the swelling recent? Could maybe be some sort of urinary/bladder infection? Is he peeping OK?
Your pic of him is adorable.
Well it's good you can get him in right away to see.
Please keep us posted!
Take care, and sending Gomer tons of licks and smooches ; )
You say you have vet visit tmrw??
I would definetly wait to see what they say, then let us know...I know your scared after your history w/other bassetts...so just see what they tell you..and post those comments, and go from there..
Plus, if you look over to the right of this forum, scroll down till you see "ask a vet", and Dr. Cheng, repost your concerns to the vet here on website, they are awsome in answering your questions..
Good Luck, and welcome to site and Dog forum...please keep us posted.