The Lighting may make it look black but I'll bet it's a yote.Rattlesnake what part of Wisconsin are you in?I have read some about some wolves moving further south in Wisconsin,and here in northern Illinois I've heard of posible wolf sightings too.I have seen some large yotes around here too that where really long legged and I doubt they where coydog.Also that pic shows what looks like a thick or bushy tail like coyotes have.