I believe that factually, as shown in the Terminator documentaries, that dogs can detect killer robots in human skin so this might be an important argument for dog. On the other hand if the cats were fitted with exoskeletons I think even the threat of the Aliens, again refer to the Hollywood documentary, might be neutralized. Just make sure to stay on the cat's good side lest they take revenge for having been burned as witches back in the middle ages.