docile

An animal that's docile is calm and easy-going.

When we talk about people or animals being docile, it usually means they're not going to cause any trouble. For example, if someone says a dog is docile, they mean you can trust it not to get aggressive. It's like the opposite of fierce or wild. Some people might find a docile pet appealing because it's low-maintenance and won't worry them with sudden outbursts. This word isn't usually used for describing plants or objects that don't have feelings.