Question 1

Does this mouse have a USB dongle or require a USB port?

Accepted Answer

No, it is a Bluetooth mouse and also does not include a USB bluetooth adapter.
I like it a lot, and have 3 of them -- laptop bag, office, and home office.  So as my primary mouse, when I do presentations while mobile, it feels just like my normal mouse.

Question 2

Approximately how Deep, how Wide, how Tall is it?

A mouse I have that hurts to use is 4" Deep x 2.5" Wide x 1.25" Tall, I have a more comfortable mouse that is 5" Deep x 2.5" Wide x 1.5" Tall.

Small number changes, but a world of difference. This is important product information missing from the "specifications" tab.

Accepted Answer

Unfortunately, this mouse appears to be similar in size to the one you say hurts your hand.  
My quick measurement is 4" long, 2.375 wide and about 1.25 high.  I would describe it as a "travel size" mouse.  
Other than size, my wife and I both use one and like it very much.  It is especially good if one has a newer, smaller notebook and doesn't want to use a USB port for the mouse.

Brand	Logitech
Name	M535
Model	910-004432
Type	Bluetooth Wireless

Power Supply	1 x AA Battery
Distance	Up to 30 feet

Interface	Bluetooth
Tracking Method	Laser-grade optical
Color	Grey / Black
Resolution (DPI)	1000 dpi

Logitech M535 910-004432 Grey / Black Bluetooth Bluetooth Wireless Laser-grade optical Mouse

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Item#: N82E16826197102