Here are the things you will need:
- an assortment of old sweaters (at least 50% animal fiber such as wool, alpaca, cashmere, etc.)
- an old pillow
- scrap paper and tape
- ruler
- scissors and/or rotary cutter
- pins
- access to a washer, dryer, and sewing machine
Source: http://www.apartmenttherapy.com/how-to-make-a-patchwork-pet-be-80294#_