Now the first thing I did was to use safety pins to mark my lines after measuring the comforter for the sizes I wanted. I needed two that matched crates I had and then the others were various sizes.
As you can see here there are two lines of pins. This was is because the comforter is really large and having a guide on each side made it much easier to make a straight line (Honestly though, your dogs won't care about a straight line. It's more for you.)
Also, try to make sure the pins go all the way through like the above photo. This is because comforters have two separate pieces of material plus a filling. The pins going all the way through will help hold everything in place so there's less chance of bunching.
As you can see, Stormy and Monyah were ready for their beds! They slept on the part of the comforter I had draped across the chair while I worked on the beds.
After I sewed the first line I then sewed a second parallel to it. The reason I did this was because I didn't want the fill to come out when I cut the sections. If you wanted to add fill you would have to leave one side open.
The above is what it looks like after you cut between the sewn lines. I worked from one end of the comforter to slowly shrink it and make it easier to work with.
The girls already staking their claim on the first two beds I finished. 
A tip for working with something this large is to roll the sides to fit through your machine after you have marked your lines. As you can see my machine isn't really made for large project but I made it work.
As you can see I was able to make several sizes that would work for a large dog as well.
I love the versatility of this project! I did not do anything to conceal the edges but you could easily fold them over and sew them or add a cute trim. Comforters come in many colors so you can find one to suit any decor. As mentioned before you can also add extra padding inside them to make them fluffier. I wanted some of these for crates so I didn't want them extremely padded.
