Ditto, we have done the same with the pets.
Ditto, I have done the same with all my cats in the past.
Ray, I'm not laughing about you not wanting to leave the old girl behind if you move. I completely understand. That's why none of my cats are buried in the back yard, but rather they all "reside" in their urns on the bookshelf.
In each case, I was offered two options. Option one: individual cremation, which is exactly what it sounds like. With that choice, my pet's ashes were returned to me in a beautiful wooden container, marked with their name and the date.
Option two: group cremation, where several pets are cremated together, and the ashes are not returned, but the crematory scatters the ashes in a designated area.
Option one is more expensive than option two. I wanted my feline friends returned to me, so it was option one for me.
My heart goes out to you hearing that you have reached the point where you need to consider these decisions for your faithful friend. You are wise to do your research now, rather than under emotional distress when the time comes. Your vet should be able to explain all the options to you, as well as the costs. They deal with this on a regular basis.
FYI, my vet handled everything each time, and about a week later they notified me the ashes were ready to be picked up. They also mailed me a bill rather than expecting me to deal with the financial aspect when picking up the ashes, because they know it is an emotional time, and people (speaking from personal experience) are just trying to hold it together at that point.
Your dog is lucky to have you as her pet parent.