Miniature Pinscher Love?

I love my miniature Pinscher dog, but the veterinary tells me she would be happier if I sterilized her.

I do not like to do that right now, but do they have a point and is it good for her?

She is 2 years old.
Update: Will she be sad?
Update 2: I do not mind the mess in the house or bed when she is on heat, but maybe she will be sad knowing she is sprayed.

She can understand many things.
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