Walt and Madge felt a strong affection and attachment to the dog.
Explanation:
When Walt and Madge found the dog, they were very delighted with it. They were a couple who loved animals and finding a dog, made their day happier. They gave the dog a lot of food, cleaned it and played with it, building a strong attachment and affection to the animal. This feeling between them and the dog was so strong, that they were sad when the owner of the dog appeared, because they did not want to deliver the animal, because they liked him very much.
