I spent a lot of time searching for the right background, I had a vision.
It actually took me years before I stumbled upon petbackdrops.com and found exactly what I was looking for. They have a great selection and do custom sizing.
At this time I can't comment on the background because it hasn't shipped yet, they do state longish shipping times at 7-12 business days. But their customer service seems good and they are responsive to emails.
Time will tell, I'm not in a hurry.