blood in urine

my collie is 6 yrs old and is spayed. recently she has been begging to go to the bathroom more and more and today i notice blood in her urine. today also was the first time she couldnt hold her urine and went in the house ( shes never dont that ever) she was diagnose with lyme disease and treated for it 2yrs ago does that have anything to do with it??? what could be going on with her??? my vet doesnt have an appt for awhile like a month while. should i just take her to a different one sooner?
thank you for any info.

[Aleda M Cheng, D.V.M., C.V.A]

Your dog may have a urinary tract infection.  Urinary tract infections are common and curable.  

Acquire a urine sample from your dog.  Ask your vet if you can drop off the urine sample  for urinalysis.  If your vet refuses find another vet!  I think that your vet will have the urinalysis performed.  Since it probably is a urinary tract infection, and since your vet is so busy your vet may simply place your dog on antibiotics, until he/she can examine your dog.  Once you are able to see your vet, bladder X-rays may be performed to see if your dog has bladder stones, or a urine culture and sensitivity if the antibiotic has not been totally effective.  If your vet thinks that your dog may have kidney disease, he/she will perform blood work.