SAN DIEGO (CBS 8) – Local letter carriers got a lesson Thursday in how to fend off dog attacks while delivering the mail.

A trainer with Sit Means Sit met with carriers in National City to teach them how to avoid dangerous dogs and what to do if they attack.

The postal service says dog bites and dog-related injuries usually peak in March or April, when kids are out of school for spring break.

Local letter carriers have reported 59 dog bites and incidents so far this year.