Did you know?
Nibbling or licking something causes the body to release serotonin. Serotonin is a happiness hormone and the antagonist to the stress hormone adrenaline. Thus, chewing calms the dog down.
Serotonin is also needed to build melatonin. This ist the sleep hormone and makes one pleasantly tired and relaxed. To reduce stress, it can be helpful to offer your dogs something to nibble or lick in a quiet place, e.g. a stuffed rubber toy or a raw bone.
Hilsbos Dog Training in English 