I have a cat (eating all the dry food fast to form a yak food sausage like thing, with some liquid stuff I can't/don't want to identify, yaked on on my brand new sheets. DH's response was to move sheets so it didn't show, hanging down on his side. I could smell something (he didn't care), found it, stripped the bed, washed in Hot water, bleach etc.. He thinks me overly sensitive!! MEN! I have 5 cats, I frequently find yak here and there. As 2 year old DD would say at Alphabet book near end and they showed Yak for Y - "YUK"