This has got me really puzzled, online at a Dutch ebay type website are puppies for sale as always, and I always look at the cav puppy pictures because they are so cute.. One of the lots for sale has a ruby, blenheim, black and tan and a tri in the litter. 4 pups and all different. It obviously is possible as there are pictures proving it, but is it common? Don't think I should put the link up here, but am just curious about it??