Instruction: Using the product's title, description, features, price, and brand, identify and retrieve the values associated with a specified set of target attributes. Output the extracted values along with their respective sources (e.g., title or feature) indicating where each value was found.

Input:
Product title: Manual Woodworkers & Weavers Waterproof Indoor/Outdoor Pet Bed, 40 by 30-Inch, Fibonacci
Product description: Waterproof Pet Bed for indoor or outdoor use. Made in the USA. Filled with recycled Polyester Microfiber. Reversible. Available in dozens of designs, you're sure to find just the right one.
Product feature: 40 x 30-Inch waterproof Pet Bed with hidden zipper, Use indoors or out, Filled with recycled polyfiber, Fibonacci print
Product brand: Manual Woodworkers & Weavers
Target attributes: Size
Answer: attribute: size
value: None
source: None