My female, spayed, dog who has just turned 1 displays some very dubious behaviour when approached by or approaches another dog. She often either lays on her back with legs akimbo or just squats and lifts one leg. She does this especially with males but also females. They, of course, are very pleased to sniff or even lick her. Can anyone explain what this behaviour means and will she grow out of it as she gets older. Also should I be concerned about this or is it just part of her development. Thanks.