Sometimes during a training session with my 5.5 month old Lab, I'll give her a command that she already knows, but instead of doing the command, she just stands there and barks at me. Not just one or two barks, but over and over like a machine gun. If I ask her to do a different command, she usually does it just fine. She seems to do this more when I ask her to 'play dead', but sometimes it happens with something as simple as 'sit'.
I don't like changing the command because in doing so, I feel it might inadvertently teach her that she can ignore me when she feels like it. So instead, I try ignoring her when she starts the barking. I turn my back on her. Sometimes she moves around to face me while continuing to bark.
Later during the same training session, I can give her the command that she barked at before and she will do it just fine.
So what is she trying to tell me with the barking?
Is ignoring her the right thing to do?
Is it okay to give her a different command without getting her to do the first one?
Thanks.