Can boars go inside the cave in Caverna?
The rules state explicitly that Wild Boars are Farm animals on page 6:


  Each animal is worth 1 Gold point. There are Dogs, and the Farm animals Sheep, Donkeys, Wild boars, and Cattle.


As you can see, Dogs are not included in the set of Farm animals. There is no inconsistency. 

Wild Boars are indeed differentiated several times from other Farm animals within the rules, but this is just because they have special rules that apply to them as opposed to Sheep, Donkeys, and Cattle. They are still Farm animals.