You can find many different types of linearts located through Google image search, Deviant art and even here on the site itself. I have seen many lovely blank renders with pups located in the images sections of BS, but here is also some results as well: http://browse.deviantart.com/?qh=§ion=&q=puppy+lineart Although you still may want to maintain by the artists rules and respect to use it properly. I hope this helped you. =)

I hope you don't mind me answering to this question , myself , when I need a lineart , I make it myself out of Balto's puppies but I have also had to use someone else's lineart , and I'd suggest rather to type the word "lineart" on the browser and check images out

I suggest you look around on the site or ask for a request.