Dog thief or dog rescuer?

A couple of years ago a farmer in Northern Sweden got an animal welfare officer on his back because his livestock was walking around in the open without access to a wind shelter. The officer was not impressed when told that yaks prefer it that way.

Why am I not surprised that the owners are hostile to you?

If you (not “you” specifically) chose not to call animal control or the police but instead chose to steal an animal, you are a thief. You will, and should be, treated as a thief.