And how to stop it?
My 2 year old has started to bark once when the doorbell goes, I know a lot of people allow one bark but I absolutely do not want barking in the house.
Full stop, outside with her friends fine but I live in a rented terrace with paper thin walls and she's a big dog with a big bark!
I used to be very strict and would immediately remove her every time she barked and she learned quickly go be quiet.
Now, she has started barking once then takes herself off to bed 
What do I do?
Should I treat her for being quiet just as the bell goes? Continue removing her for barking?
I'm paranoid about a neighbour complaining me :(