This will get you thinking.
Our beloved Yorkie 'Bobby' loves to bark, at anyone who walks past the house or when the dogs about start to bark he thinks 'Oops I am missing something, don't know what but I better join in'
We went to Spain for four months from January this year, we were surrounded by villas that had dogs of all shapes and sizes who welcomed each morning with a dog chorus that continued to siesta time and then from about 4pm until it was dark.
Bobby did not bark once in reply.
However he did reply when the dogs next door barked - they were owned by an English couple who spoke to them and us in English not Spanish.
Just made us think did the other dogs bark in Spanish so Bobby could not understand them so did not bark in reply to their barks!!!!
Hmmmmmmmm!
