Suppose, just as an example, I have a website with domain www.gifts-for-dogs.com.....but after a few years I start selling stuff for Cats and Fish. I may not keep enough of a range of products for these other type of pets yet, so can't justify changing the domain name and logo (to something like gifts-for-pets.com) just yet....but envisage that I eventually may have to in the not too distant future.

What would be a good strategy here and what are the steps I would have to consider before making these changes?