Answer:
They would move secretively, often looking for food.
Explanation:
Skulking is the act of an individual or anyone who secretly creeps around, keeping out of sight, and usually have some bad intentions.
Among the options given in the question, the best use of the word 'skulk' is in the sentence "they would move secretively, often looking for food".
It shows the manner in which the dogs would loiter around the place, looking for food or any chance of getting food.
Thus, the correct match to the word "skulk" will be in the sentence
They would move secretively, often looking for food.