Well, dogs can get scared of robot vacuums if they have never been exposed to it before, however, with proper introduction, they can adapt to it.  If a dog is scared of a robot vacuum, it is important to introduce it slowly to the dog. Start by placing the robot vacuum in another room and allowing the dog to get used to its sound. Gradually move it closer and allow the dog to sniff and explore it. Offer treats and praise when the dog is around the vacuum to help create a positive association.