Quite simply and perhaps obviously (or maybe not so obviously?) dogs brains do not think like ours.
Is your family all using the same word for a command?
If Mum is saying ‘Bella* come!’and Dad is saying ‘Here!’ This can be a confusing situation for your dog.
Don’t expect Bella/*insert name to know just what to do. ‘She’s heard it enough’ is a common complaint I get from owners. She’s been confused regularly by you is more like it.
Also, do the words you are using as commands have more than one meaning or action associated with them? (this applies for different pack members). Well gosh, that is confusing.
For example ‘Down’ is used for lie down and can be to get off the sofa. Have a think about your situation, Selina McIntyre, Dog Behavioural Consultant & Dog Trainer, Dogs Best Friend.