Best iPhone for pet action/portraits?

I am skipping buying a camera since ‘the best camera is the one you have on you’ and upgrading my iPhone 7 to one that is best for taking photos of my dog - action shots and portraits outdoors, in the forest and in the house. I love having the bokeh so the dog is the obvious subject and also the ability to choose which subject to focus on.

Which iPhone is best for this type of photography?

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