I can make these pillows with Velcro removable (and washable!) slipcovers in two sizes: Small 24"x24" and Large 35"x35". The insert is made of a sturdy off-white ticking and stuffed with either 20 oz (small) or 40 oz (large) washable polyfill. They are available in the same fabrics as the collars plus the pictured zebra print with either hot pink, turquoise or red piping trim.
I was also thinking that not only are these lovely (and comfy) dog beds but they would also make super floor pillows for my kids' playroom. So if you know anyone who doesn't have pets but has kids please let them know that these are available.
The small insert and slipcover is $35 and additional small slipcovers are $20. The large insert and slipcover is $45 and additional large slipcovers are $30.