The dog chewed with its mouth open.

If the dog has been shaking and chewing, it is probably because it feels anxious or nervous. This behavior is usually a way for a dog to release stress, especially when it encounters a situation that makes it nervous. For example, dogs walking outside may be nervous when they see other dogs or strangers, so they will chew something to relieve their nervousness.

If dogs chew at home or at rest, it may be because they are bored or need more chewing exercise. In this case, you can provide the dog with chewing toys or grinding bones to meet its chewing needs.

However, if the dog chews something that it can't swallow or is dangerous, such as wires, plastic bags or toy parts, then you need to stop it immediately. This is because these items may cause suffocation or digestive tract obstruction, which will cause serious harm to the health of dogs. If you find a dog chewing these dangerous things, you can use the training password to stop it and provide safe chewing toys.

In a word, it is normal for a dog to chew, but if it chews something dangerous or chews frequently, you need to take appropriate measures to protect its safety and health.