Use this passage to answer the following question. The child decided it was time to walk the dog and got out the leash. The dog heard the child and came running, wagging its tail. The dog really liked to go for walks with the child. They went out the door together and walked through the park. The dog sniffed every tree and watched the squirrels play. The dog was happy and did not want to stop walking. What inference can be made from the bolded line in the passage?