Since momma Ripple is a brindle, there may be a slight possibility that the pups will carry the brindle gene, or that the brindling is "hidden", even if they don't exhibit it. For more detailed information on how the brindle gene enters in to the mix, you may want to refer to this link: http://www.1st-writer.com/ColorGenetics/lesson6.htm#Co-Dominant_Ebr   These pups will be UKCI registered, but unfortunately UKC will not accept brindle as a "breed standard" pattern for rat terriers, so a brindle or trindle pup would not be able to be registered UKC and/or shown at UKC shows.