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: Dean and Tyler "Patch Collar", Nylon Dog Collar with EXPLOSIVE K9 Patches - Black - Size: Small - Fits Neck 18-Inch to 21-Inch
Product description: Dt patch collar is ideal for working breeds involved in search and rescue and k-9 law enforcement, while also comfortable for everyday pet use.
Product feature: Strong double ply neoprene nylon, Massive one easy release click buckle, 2 patches included, Easy removable patches, Professional looking collar
Product price: $34.95
Product brand: Dean & Tyler
Target attributes: Size
Answer: attribute: size
value: small
source: product title