never herd that before dug one last week which was carrying cubs it was also hunted for a long time with a pack of hounds and marked to ground it made no difference to terrier or hounds.have dug a few more over the years which were carrying cubs.i rember i dug one 3 years ago st. patricks day which was heavy in cub and the dog had to dig on a long way throw tight tubes before reaching the vixen .