Hi. Biscuit is 5 months old. He barks when the girls are outside and he can't run and play with them or when I leave the room and he can't come with me. I consistently correct him, asking him to settle. But, as soon as I walk away, he's barking again. Someone suggested getting him a bark collar. I was not sure if that was a good idea so I thought someone would know. Is Biscuit too young? Any suggestions on barking are welcome. Thanks. Susan