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

Input:
Product title: Hartman & Rose Horse and Hound Dog Collar, 18 to 20-Inch, Cobalt Blue
Product description: A colorful 22 karat gold plated crystal encrusted horse bit. Fits perfectly around you dog's neck. 100-Percent vegetable dyed Italian leathers. Classic European styling. Matching leads available.
Product feature: 22 Karat gold plate, Sapphire Swarovski Crystals, Handcrafted in Canada, Available matching lead, 100-Percent Italian leather, Italian hardware
Product brand: Hartman & Rose
Target attributes: Size
Answer: attribute: size
value: None
source: None