NB: this is my first instructable, so if you think I missed anything or need to change something, please let me know!
Step 1: Source and Gather Materials!~~
~ Mattress protector or pillow case (old and smelly is great as it is likely to be familiar and encourage your pet to sit/sleep on it)
~ Pillow or Hobby Stuffing (how much you will need depends on the size bed)
~ Fabric to Cover the bed (Polar Fleece for something warm and soft for the gentle pets, or a canvas/drill for the tougher types, or an old blanket, doona/quilt cover)
~ Thread, any colour you like to match your fabric, go for an upholstery thread if you can as its a bit stronger.
~ Scissors, sharp enough to cut the fabric doubled over.
~ Soft Sewing tape measure and or Ruler.
~ Pen or Pencil or Tailors Chalk for marking.
~ Sewing Pins to secure your fabric.
~ Patience and a little creativity.