What makes you think that?
it seems like Astra is very territorial and possessive over her man (lol) and her bed.
She’s see that bed as yours and not hers, and it seems like she’s defending her territory.
I understand this is a difficult situation and I’d be nervous around her too, but it’s not right to hate her, or have such a negative attitude to her.
Firstly, dogs are very intuned to humans, and she would pick up on your attitude towards her. And secondly, this is not her fault, it’s the fault of the owner. He needs to look into training some obedience into her, insteading of blaming her for his failing.
And I know it’s hard, I have a little dog who has the potential to be possessive and territorial, but there’s absolutely no use in blaming them, or taking it personally. It is not their fault, it’s the humans!