Do have your dryer vent serviced at least annually.

Do hire a C-DET Certified contractor to service your system.  Make sure they are fully insured.

Don't use plastic or vinyl connector hoses to exhaust your dryer.

Do install a bird guard-- they love to nest inside your vent.

Don't push your dryer up against the wall, crushing the connector hose.  A crushed or kinked hose can be hazardous.

Do check the area around and behind your dryer for lint...if any exists it could be a hazard and signify venting problems.

Do clean your lint screen before every use.

Do look for water or condensation stains on the wall or ceiling around the dryer.  If present they can signify problems.

Don't exhaust your dryer into any part of the house.

Do insulate dryer vent duct work that passes through unheated areas.

Do leave a clearance of at least 18" around your dryer.