I think as long as you have enough time (and money!) to spend on a yorkie, you will be okay. I think the only thing would be that you shouldn't get a yorkie that will be under 4 pounds as an adult. If the yorkie is smaller than that, you will have problems since the boxer can inadvertently hurt the yorkie.
Boxer are also notorious for not getting along well with other dogs, so I would assess if the boxer is friendly with other dogs, relaxed and playful when he/she meets other dogs. If not, you would have to get a professional in to sort it out for you.
Yorkies are high maintenance dogs (but how we love them!) and they are very addictive! I thought I should warn you. One yorkie is almost never enough!
Besides all the hereditary illnesses, they have sensitive and tiny stomachs, are very active and requires daily grooming. Yorkie are also very clever, so you need to keep their little minds occupied, otherwise you could lose many hours of sleep or worse, many valuable possessions.
I don't think Yorkies are for everyone, but if you are willing to spend a lot of time and money on a gorgeous, spunky little dog, they can be the perfect dog!
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