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

Input:
Product title: House of Paws Water Resistant Silhouette Print Oval Dog Bed - Medium
Product description: Waterproof dog mat. Modern design of tan dog breed silhouettes printed all over onto black waterproof fabric. The fabric is exclusive to House of Paws. The beds are ideal for muddy paws and preventing uncomfortable soggy bedding. Available in 3 sizes Medium, Large and X Large.
Product feature: Product Color: Black/Cream Dog Print, Oval Dog Bed 55x50x25, Four-legged quality and comfort
Product brand: House of Paws
Target attributes: Size
Answer: attribute: size
value: medium
source: product title