I'm sorry your girl is having this problem.
Did the vet see it?
Since it is affecting her ability to urinate, sounds like an ultrasound or other imaging will be required.
I do know of a couple Yorkies ages 6 - 7 who had abdominal hernias repaired successfully. The surgery was comparable to spaying in terms of invasiveness and recovery.
__________________ Kristin, Max and Teddy |