I searched several places where there are all kinds of corpses. I only found non-decaying dog corpses in Thais Troll Cave east of town. These corpses are in various states of decay.
Corpses can be found in various places in this cave and on the surface next to the campfire.
Additional Information: It is interesting to note that the Trolls of this cave use dogs to cook their meals. It is a bit sad, but they have a special butchery where dogs are slaughtered and a kitchen where the dishes are prepared. In the cave, we can also find a cookbook with descriptions of dog dishes.
There are two dog corpses that won't ever decay in the 'troll-campfire' in the eastern part of Thais.
Check this: https://imgur.com/a/HHdjou2
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