The question seems to be a riddle that combines unrelated elements, making it difficult to interpret directly. The first part, "flying over a desert in a canoe with wheels falling off," is highly illogical, and the second part asks about the number of pancakes needed to cover a dog house, which also seems unrelated.
Given that the scenario is impossible, the question about the number of pancakes likely doesn't have a meaningful answer tied to real-world logic. It's possible that the entire scenario is designed to be absurd, and thus, calculating the number of pancakes needed is irrelevant or impossible.
In conclusion, the question is likely a trick or nonsensical riddle, and the answer is that it’s impossible to determine how many pancakes it would take to cover a dog house based on the given scenario.