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: Tan Leather Teaching Lead: Dogs Under 40lbs
Product description: It's a belt. It's a leash. It's a stand-in for a bulky crate. The When Dogs Talk Teaching Lead is the stylish, hands-free way to walk, comfort, train and bond with your dog. Using Sarah's compassionate and easy-to-understand techniques, you and your dog will discover that you're more than a pack...you're a family!
Product feature: Designed by best-selling author and dog behavior expert Sarah Hodgson., Ingenious design allows for use as a traditional leash, a hands-free lead or an indoor/outdoor training aid., 6' length. When used hands-free, fits up to a 44" waist. 15" extension sold separately., Supple tan leather with nickel hardware., Free, 20-page ebook with purchase.
Product brand: Sarah Hodgson
Target attributes: Length
Answer: attribute: length
value: None
source: None