Instruction: First, identify the target attributes from the provided list. Then, scan the product title, description, feature, and brand to extract the values associated with each target attribute. Finally, create a list of dictionaries, each containing the extracted attribute, its corresponding value, and the source where it was found.

Input:
Product title: Barkworthies Chicken Sausage For Pets
Product description: Bark worthies Chicken Sausage is an all-natural, protein-packed treat that's perfect for training. Each sausage is approximately 12 Inch long.
Product feature: All Natural Ingredients, Great For Medium To Large Dogs, Made From Grass-Fed, Free Range Cattle
Product brand: Barkworthies
Target attributes: Chew Type
Answer: attribute: chew type
value: None
source: None