There are a lot of things that could be going
on. It could be anything from a
urinary tract infection that can be cured with antibiotics, to kidney failure, to "laziness" as a result of the leg pain. If she's a senior dog (7 years and up) she may have lost some of the natural muscle tone of her bladder and urinary tract and simply doesn't feel the urge to go until it's too late. Either way, it's time to head back to the vet - along with a urine sample.