how to Initialize a dictionary list

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C#

Dictionary<string,> newList = new Dictionary<string,>();
newList.add("cat", "dog");

From the above code I'm trying to initialize the dictionary list. coz in my case I pass it to a function where it get filled and comes back.

Some times it comes back as emty list so when i use it, its throwing null exception.

So I want to initialize the list before i pass it to the function. To do that I added two values to the list assuming its an initialization, but its not.

Could you please give me the right code for initialization.

If I initialize before a pass it, would it solve the problem or where should i initialize it?