Hey JACK ~ Don't *blow it*, Dude!!
You could prolly get away with almost ANYthing -
EXCEPT peein/poohin in the wrong places!

UTI is a possibility...
But the White Coat will *NEED* a "sample"!
They can "take" a sample from him, but most Vets like to
be "given" a sample that was produced willingly.

When Boots was due for a test;
I'd "load him up" with extra water via a needle syringe
(LESS Needle part) - LOAD syringe; OPEN Kat mouth;
INSERT syringe over tongue; UNLOAD syringe;
(ignore *sputtering* sounds from Kat);
Repeat several times; Wait for Results!

Half a Cup of water was usually "processed" and ready for
"return to sender" in less than an hour.

"Collection" was a bit *trickie*!
Da KAT would be tethered to a chair with a SHORT string; and
"The Box" was the only thing within reach of the string.
"The Box" was a standard litter tray withOUT litter;
covered with clean plastic garbage bag AND a few
shreds of clean, torn, paper in the bottom.

When the "need" finally arose;
Boots would "do it" in the box and I'd spring to action
BEFORE he started trying to cover it and tear the bag/liner.

The hard part was and then attempting
(with only TWO hands) to the sample from the Box + Bag
into a storage ZipLock Baggie!

"WE" usually were able to deliver to Doc Mike...
But I remember one time Boots just wasan't ready to "dump"
before it was time for our appointment.
I'd "loaded" him with what I figured was a QUART of water -
he actually "SLOSHED" when I picked him up
gave him a "shake"!

Called Doc and The Gurls laughed and said to bring him on down and
HOPE he didn't empty the tank before we got there.

A couple hours in the "Sample Cage" (wire floor with a pan below) -
produced a small flood just before closing time!

As for WHY?? he may be peeing outside da Box...

Give his less than *warm* reception by Miz PeaNutter;
he MAY be marking his territory in frustration.

Do you have a very small room (closet ??) with a HARD floor?
Put him in there with only water, toys, and a Litter Box
for a while to be SURE he's using da box.

C'mone, Jack - get wiffa Program!!

/s/ Phred
.