WHy do some dogs suckle on things like their bedding and soft toys. It looks kind of like a comfort thing like what children do with comfort blankets.

My friend has a 11 month old yellow lab that suckles so hard on his bed that he has sucked a hole in it (not chewed). Also our Jack Russell Jessie sucks on her soft toys and sometimes sends herself to sleep still doing it.

Just wondered if anyone knows why that was all???