There are many things that we can assume about shrews in relation to their similarity to mammals, but I have a feeling that moisture content is not one of them. Mammals are unusually wet and bloody and harbors of all kinds of harmful microbes to an unbelievable level compared to birds or reptiles because of their time spent as primarily fossorial animals in a low oxygen period. Shrews never went through an even remotely comparable grade during their evolution; though they spent time as burrowers, it was never to the same degree of specialization as the ancestors of mammals, and those grades existed during a high-oxygen period. Shrews are probably more like early therapsids in every regard except appearance and milk. Unlike a similar-sized mammal, which would have a pretty awful time if its tail got lopped off, shrogs might not gush and bleed to death as readily. Even if they did, losing a tooth isn't fatal in mammals, and beyond the meatier base, losing the tail is only as bad as losing a hand or foot, which mammals can also survive as long as they can reach around to clean the wound.
The thought process for the harness is something more like, tying log to log makes it not move, therefore tying shrog to log also makes it not move. I'm gonna edit that section to clarify that part and make it less like locking your wife in a basement and more like tying a dog to a doghouse, though.