In the statement my sister gave dog a dish of water is indirect object?

You are correct! In the sentence "My sister gave the dog a dish of water," "dog" is the indirect object.

Here's why:

* Direct Object: The direct object is the thing that receives the action of the verb. In this case, the direct object is "a dish of water" because the verb "gave" is directly acting upon it.

* Indirect Object: The indirect object is the person or thing who benefits from the action of the verb. In this case, the dog benefits from the action of being given the dish of water.

Let me know if you have any other sentences you'd like to analyze!