Instruction: Extract the value of the target attribute from the given product information and output it along with the corresponding source.

Input:
Product title: Clifford the Big Red Dog 35th Birthday - Bean Bag Plush
Product description: Clifford the Big Red Dog 35th Birthday bean bag plush. Taller than a two-story house and redder than a fire engine, Clifford has been a classic storybook character since 1963, Scholastic, released 1997. Approximately 7 inches.
Product feature: Clifford the Big Red Dog, Official Scholastic product, New with tag., Released 1997
Product brand: Character Bean Bags
Target attributes: Form
Answer: attribute: form
value: dog
source: product description
attribute: form
value: dog
source: product title
attribute: form
value: dog
source: product feature