A lot of people have complained about some barking, there are some negative reviews about it, but I've always thought that it's just some people who don't like the dog barking while gunfire. Today I found out that on some PC configurations there was a looping unbearable barking. It's a shame that such a bug survived there for almost 2 years, levels with the ratters must have been awful, even downright unplayable, brrr.