A professional dog trainer explains the instinctual reason driving the behavior and offers some expert advice on how to stop your dog from chasing cars.

BIG QUESTIONS
Don't worry: It's not because sirens hurt dogs’ sensitive ears.
The literal meaning of ‘sic’ is ‘so’ or ‘thus.’ But the way writers use it is a little more nuanced.
The meaning of the “wait for green” traffic sign is less redundant than it seems.
Olive Garden makes good on its promise of unlimited breadsticks, but the deal does come with some unpublicized caveats.
Before you talk turkey this Thanksgiving, find out what we know about the phrase’s meaning and origins.
Those frilly paper caps on your turkey's legs have been called “turkey frills,” “turkey booties,” and even “turkey panties.” Here’s where they came from.
Dropping that ‘t’ sound is an example of what linguists call glottalization, or replacing a sound with a pause in the vocal cords.
Solariums are nostalgic for many customers, but Wendy's thinks they’re dated.
The word ‘gross,’ which came to English from French, took on a variety of senses in English related to size. But the ‘gross of today is different from the ‘gross’ of the past thanks to teens.
Ever wondered if yams and sweet potatoes are the same thing? Read this before sitting down to Thanksgiving dinner.
The word predates social media.
There are a few reasons—including a little something to do with the horse and buggy. Find out more about the history of Election Day.
The "Ty" on the iconic heart-shaped Beanie Babies tag isn't an abbreviation. It's the name of the toy brand and its notorious founder.
Climate can cause a big difference in how much hair a lion grows.
Pigeons aren’t known to be particularly talkative birds.
The origin of ‘towhead’ has roots in 14th-century England, when ‘tow’ often referred to textile fibers.
To keep porta potties (relatively) clean, sanitation workers require special equipment and a strong stomach.
When it comes to superstitions about bad luck, indoor umbrellas are right up there with broken mirrors and black cats.