What is the vegan stance on working animals?

For example, a farm I used to work at had a number of cats hanging around the barn that would kill mice and rats, similar to ship cats.

Another farm I worked at had a dog that would roam the fields killing various birds and rodents.

And of course the thing that brought this up for me is horses. It’s not super common like it used to be, but horses (or other pack animals) are still used for transport in many instances, such as to get supplies to remote locations. Also I believe pack animals are also still pretty common in many rural areas of developing countries.