Last weekend I heard some sounds I've never heard before. At first, I thought the sound was a wild dog attacking a fawn or something...because it sounded like a growl...but yet it wasn't low pitched like a dog...more of a higher pitched yelp. It was in the morning, and lasted only a few seconds. I grunted a couple times...and a spike walked right by me 10 minutes later. I heard the same sound a second time a couple minutes before the spike walked by..but in a different direction. The spike was acting normal..not alert..just very calm and by itself. It wasn't a snort/weeze..b/c I experienced one of those up close and personal a few weeks back. Any idea on what I heard?