There’s a good boy, girl, dog, etc.
Definition 1 of 1

Positive Reinforcement
Often used to positively reinforce a desired behavior or action, showing approval.

There's a good girl for finishing your chores!
Affectionate Tone
Spoken with a warm, affectionate tone to express fondness, especially towards pets and children.

There's a good boy for sharing your toys with your sister!
Not for Adults
Rarely used for adults, as it may sound condescending or imply they require guidance like a child.

You wouldn't say 'There's a good woman' to your boss after a presentation.
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