I think you are wonderful to help support your friend in this.
I really like the idea of the key fobs. You could find the hardware on amazon or ebay along with the webbing. And finding ribbon with a pet theme should be fairly easy. Sew the ribbon to the webbing, cut to the appropriate length, and then attach to the hardware. I made some of these for my great niece and her friends and they loved them and most still have them 3 years later.