(WILX)   Many people are planning to dress up their pets to take them trick or treating with the kids, but Halloween can be stressful for pets.

"Dogs can get injured just by tripping over a costume. Is it blocking sight or their ability to breathe?" asks Angela Falcsik of Pawsitive K-9 Obedience.

And costumes are just the start.

Pets can get into all kinds of mischief on Halloween.

With kids running around in costume, the trick or treat environment can be confusing and stressful for dogs.

"You want to make sure you're watching your dog's behavior, and if your dog is showing any signs of hesitancy, shaking, fear, if they're licking their lips a lot or salivating or salivating a lot, those are all signs of stress," Falcsik warns.

Read more from our NBC affiliate WILX.