nylon plastic mesh netting with studded with metalic barb fasteners conneted to a high voltage charged capacitor could be used and sprung to trip them up and short them out if they are on attack mode. Bolas like South American cowboys used could trip up and take these down. I wonder if a tazer could do it...the voltage surge could emp them.
True, also I’ve just wondered about the effects of regular rifle bullets.
To armor them up would require a lot more battery, motors etc.