Squeakers

wolf size urt with three rows of teeth .. will bit if Attacked..
can be domesticated
Certain forms of large, domesticated urt

please read . not a mouse or a little rat ...
"The urt is a loathsome, horned Gorean rodent; s̲o̲m̲e̲ ̲a̲r̲e̲ ̲q̲u̲i̲t̲e̲ ̲l̲a̲r̲g̲e̲,̲ ̲t̲h̲e̲ ̲s̲i̲z̲e̲ ̲o̲f̲ ̲w̲o̲l̲v̲e̲s̲ ̲o̲r̲ ̲p̲o̲n̲i̲e̲s̲,̲ but most are very small, tiny enough to be held in the palm of one hand." — Nomads of Gor, page 125.

"Somewhere I heard the squealing and thrashing of two of the giant urts fighting in the water, among the floating garbage." — Raiders of Gor, pages 119-120.

"Through the bodies, an urt came pressing towards me. It was a large urt, darkly furred. It had one tusk broken at the side of its jaw. It was about four feet high at the shoulder, extremely large for this type of animal. It had a silver snout." — Players of Gor, page 283.

I felt my leg then caught in the jaws of an urt, like triple bands of steel, set with needles, and was dragged beneath the surface. I thrust my thumbs in its ears and tore it's head back from my leg. — Raiders of Gor, page 171.