Formal:
* This is a typical diet for a Golden Retriever.
* The following is an example of a Golden Retriever's diet.
Informal:
* This is what a Golden Retriever typically eats.
* This is the kind of food a Golden Retriever needs.
* Here's what a Golden Retriever eats.
More specific:
* This is an example of a balanced diet for a Golden Retriever.
* This is what a healthy Golden Retriever should eat.
* This is what I feed my Golden Retriever.
You can also use the phrase "a Golden Retriever's diet" to refer to the type of food they consume.
The best way to say it depends on the context and your audience.