Given the task definition and input, reply with output. You are given a sentence and a question. You're expected to write the correct answer based on the sentence.

Sentence: Terrie leads her dog team to deliver some food and other things to someone in a snowbound cabin. Terrie's dogs pull the empty sled to a nearby supply station, then pull the loaded sled on to the snowbound cabin. Question: In which situation will the dogs have more difficulty in getting the sled moving swiftly?

when the sled is weighed down with supplies