Hi, Sara ~ Cinder, Smokey, Boots, an Dad sure hope you're starting to feel better!

Dad found this from a British Vet site ~ might help in getting a 'sample', if that is still a problem...

How to Collect a Urine Sample.

Early morning samples are best.
Unusual circumstances will inhibit many dogs from urinating. To overcome this, prior to collecting the sample it is worth taking steps to increase the amount of urine in the bladder, before you try to collect it.

Take the dog out last thing at night at least an hour earlier than normal.

Wait an extra hour in the morning before taking the dog out for its first walk.

Put the dog on a lead, and take it out carrying a suitable container (e.g. A margarine carton or an old plate/bowl). All containers must be scrupulously clean.
After the dog squats or lifts its leg, push the container into the stream of urine, trying not to catch the first few drops. Remove the container from the urine stream before the flow has stopped.

Transfer the urine to a screw-topped container, (most vets will be happy to supply these on request), and fill in the details on the label. Store the sample in the refrigerator if it cannot be taken immediately to the surgery.

Note: Those Brits make it sound so easy!

Please let us all know how you're feeling today.