Designed to do this!

A BackBlip: Daisy, our 'Grand-dog', on a walk by our local 'mountain', Bennachie, suddenly pulled at the lead and tried to disappear into a drain under the track!
But it is what she was 'designed' or at least trained to do, as a Patterdale Terrier. Terriers go underground after other animals. Patterdale in the Lake District is a fox hunting area (on foot, by farmers not folk on expensive but beautiful horses)