From the ArcaMax Publishing, Cats & Dogs Newsletter:
http://www.arcamax.com/news/catsanddogs/s-174516-570379
If your pet is having a urinary-related problem try to bring in a
sample of urine if you can. Your vet will have instructions on how to
do this. It's not that hard. We love clients who bring in urine
samples from their pet because it means less work for us!
If urine must be collected by veterinary staff there is a chance
you'll have to pay for it, especially if your pet won't "give it up"
on his own and they have to obtain a sample using either a syringe or
catheter.
The same goes for fecal samples. If your dog is having diarrhea the
vet may want to examine a stool sample. Bring one just in case. If
they don't need it, no harm done.
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This tip courtesy of Dogproblems.com