Always Observe
You should always keep an eye on your pet for two main reasons. First, you want to make sure that your pet isn't being destructive or getting into something that could be dangerous. When you're out of the house, consider putting your pet in a comfortable crate. Next, you want to keep an eye on the health of your pet. Observe behaviors and mannerisms, and address any issues that may arise, such as a sudden change in behavior, isolation, or illness.
