Instruction: Parse the product information to locate the target attribute, and then provide the extracted value of the target attribute and its source in the output, specifying None if the attribute is not present.

Input:
Product title: Ims Pet Cadet Beef Bull Stick Dog Chew
Product description: Cadet 4-Pack Bull Stick All Natural Dog Chew 6 Inch Bully Sticks, 4 Bully Sticks per Pack, Dog Treats and Chews.
Product feature: Beef Bull Sticks 4-Pack, 6" Inch, From Brazilian Cattle, Promotes Healthy Teeth And Gums
Product brand: IMS PET
Target attributes: Chew Type
Answer: attribute: chew type
value: bully sticks
source: product description