After professionally cleaning this Kazak rug, we removed all the yarns that had been damaged by our client's dog. (Of course, the dog had already achieved a bit of success in that regard.) We then rebuilt the warp and weft, the white square area shown below.
Lastly, we then reknotted the pile striving to match the new yarns to the rug's original lovely colors. The photo below shows the reknotting in progress, before we cut down the reknotted pile to the same length of the original pile. --www.traditionalrugrepair.com