San Antonio Express-News: Why your friendly dog may suddenly act aggressive โ€” and what to do Why your friendly dog may suddenly act aggressive โ€” and what to do MSN: Why Is My Male Dog Being Aggressive All of a Sudden? How to Stop It Why Is My Male Dog Being Aggressive All of a Sudden? How to Stop It Los Angeles Times: Experts Detail How to Spot the Warning Signs of an Aggressive Dog and De-Escalate Without Getting Hurt Experts Detail How to Spot the Warning Signs of an Aggressive Dog and De-Escalate Without Getting Hurt