Yes, I am 100% joking... well, except that my cat really did do this to a book I had planned to post and I am mad at said cat!!  :-p 

*sigh*  Oh well!!

Mine throw up in really weird places but so far not on any books - they're mainly chewers. Can't remember how many books I've found with those cute little punctures on the corner of a book. But I'm mostly my own worst enemy - made a 1/4" rip in a Melinda Wells that had a decent WL line. Naturally I posted it before I finished it, so had to decline the request.

One of mine sneezed on a WL book.  I was not pleased.  He also has chosen my expensive down comforter as his favorite place to expel hairballs.  On the plus side, this has made me extremely skilled at cleaning comforters and has led to me being hyper aware of salets on duvet covers (so far Ikea seems the best bet) . 

I have never had an RC, but I think I will have to add one now. 

IMO, if it just pukedj just  on the cover, and you cleaned it off with a disinfectant wipe and there is no cover damage, post it.

I thought a 1/4" rip was postable.  
Isn't the rip limit 1/4", but it is OK to post a book if there is up to a 1" x 1" square cut out of the cover.  
Sometimes PBS rules are a little flaky.  Stains and small rips are no-nos, but a big gaping 1 x 1" cut-out is OK?
If the cover is stained or ripped and the damaged area fits in a 1" square, what is to stop the sender from just cutting out the bad area 1" (or smaller) square?  The receiver wouldn't know if a sender did this or the used book store owner.
Please note:  I have never done this, nor am I advocating this, just pointing out quirky rules...

I guess the cat didn't like the book!

A cover rip of 1 inch or less is postable.

I almost posted something just like this the other day only it was that my dog ATE one of my books!  I was soooooo mad.  It was really nice hard back with dust jacket that I had gotten from here.  She ate the jacket and chewed the back cover off!!!!!   Ohhhhhhhh I was SO mad.  Guess one day I will learn not to leave books out where she can get them.  They are her favorite chew toy. 

Whoa, thanks for the 1/4" rip information - I may just move the book from my keeper shelf to my Bookshelf.

My rabbit has chewed so many of my books. LOL He's always jumping up into places I wouldn't think he could get to. grrr!

My parakeet used to love the chew the bottom of my books while I was reading them...

EveDallas: I guess the cat didn't like the book!

My nieces practice the same form of literary criticism. When they don't enjoy a book I read to them, they soil it or hurl it across the room.

Kate, if the moisture was absorbed into the cover, the damage would be apparent, so yeah, it would then be unpostable.  But as I said, if there was no cover damage, then it should be fine to post.   Maybe it's because I have cats, but cleaned cat puke is preferrable to me than what I know is on all books but try not to think about----human fecal matter and other bodily fluids remains from people not properly washing their hands. 

My mom just sent back a book to me that their dog got ahold of in his puppy phase and chewed on.  ugh.  oh well, it isn't bad enough that I can't offer it as a freebie!

Not for nothing, but the guidelines don't actually say anything about pet vomit...I guess that whole "No liquid damage of any kind" rule would apply, but if your cat's vomit was nice & chunky... well, then I see a loop hole there!

Of course, there is the "no soiling" rule, but if you got the chunks cleaned up pretty fast, then you're in the clear.

If the book was a hardcover, and the puke was limited to the cover, just ditch the dust jacket & the problem is solved.

You might run into some people with RC's of "no moldy, must, smokey smelling books" but I doubt anyone has a "no puke-scented RC."

As long as the cat didn't chew or gnaw on the book, I think you're safe to post!

I'm with Dawn, I'd just post the book. If it didn't leave any damage, I don't see the problem. It's not like you're going to send it with bits of vomit still stuck to the cover.

I've had a book for many years - one that I will never post.   I looked through it the other day and noticed the back cover had little holes in one spot where my little parakeet decided to gnaw on it.  

Now I treasure the book more since she was my first pet.

ROFLOL at some of the replies!!!  :)-  There's no way I would post this, even if it were clean-able (which it's not)... IMHO it just falls into the ick factor, and not something appropriate to pass on to others, even if they didn't know the history!!  Keep it myself, MAYBE, if I can thoroughly get out the smell, but I'm thinking there are paper recycling plants for a reason....    ;)