Sentence:  I grant that the dog may not be really protective , based on his training , but if you were <WSD>roaming</WSD> the streets looking for a purse to snatch or a young lady to molest , how quick would you be to attack a person strolling with a dog ? 
Meaning of the word marked with <WSD> tags:  move about aimlessly or without any destination, often in search of food or employment