Yesterday flying approximately 200 feet up and 1500 ft. out, I encountered several birds circling my drone. I assume they thought it might be bees or another strange bird so I began a return home. Shortly thereafter two very large dogs entered the park barking and jumping wildly.. I tried bringing the drone down more quickly and when it got 3-4 feet off the ground a German Shepherd size dog jumped at my drone and I assume a prop hit him in the nose so he didn’t bite it but knocked it down. Replaced props but all ended up okay. LESSON LEARNED: watch out for dogs!