[header] How to report a dangerous dog [title] Keep yourself safe. [step] If you come across an aggressive dog, particularly an unattended stray, the best thing to do is to slowly back away from it before you get too close. Aggressive dogs do not like you to enter their area, so don't be tempted to try to calm it down by moving towards it. 
[substeps] If you run, the dog may go after you and attack. Keep calm, avoid strong eye contact, and do not enter their space.