Lots a animals become agitated by humans in contraptions that they haven't experienced a lot. I once talked with a wheelchair-bound man that told me that it is

Lots a animals become agitated by humans in contraptions that they haven't experienced a lot. I once talked with a wheelchair-bound man that told me that it is very common for dogs to bark at people in wheelchairs if the dog hasn't see that before. Most animals and especially wild animals are just neophobic, including humans.