Stink bugs are a favorite snack of most dogs and cats. Fortunately, these bugs aren't poisonous. They can, however, cause dogs or any other pet to vomit or slobber excessively due to a stomach condition. Don't be concerned; these side effects should go away on their own. However, if your dog eats a lot of stink bugs, he will develop a hard fist-like mass in his digestive system called a Bezoar, which will prevent him from passing through the digestive tract. It's possible that the dog will need surgery. If you think your dog has ingested an excessive amount of stink bugs, you should seek professional assistance.