How long after mating until a Tibetan mastiff gives birth?

A Tibetan mastiff gives birth about 63 days after successful mating, possibly 2 to 3 days earlier or later. Estimate the due date from mating time to prepare for whelping. A few days before birth they may nest, eat less, and urinate more. After two months of pregnancy, watch closely; if she urinates often and is restless, move her into the whelping box.