Here is a kilim & piled runner size alteration example. Client requested it to be shortened as it was too long for their hallway. Apart from the size, it also had a pet urine stain, which is very difficult to remove because it was left untreated long time. Here is a link for what to do in case of a pet urine accident. They should be treated as quick as possible, otherwise the acid in pet urine will cause colour run, fix the colours permanently, cause big damage to fibres of the rug.
Pieces like this one is relatively easy to alter as it is not only piled, parts of it was flat woven (Kilim).
pet urine damage can be seen very clearly
first thing to do is to remove the knots consisting the pile