Just watched it - wow.
That owner is a piece of shit. His 'efforts' to stop the dog were laughable. I found myself rooting for the poor horse to just kick the dog in the head, and that's not something I thought I would say.
My first thoughts were surely it needs to be euthanised - she cannot be trusted.
But, it's actually the owner that is the issue. The owner can't be trusted.
With the correct owner, it could be that the dog could go on to have no further incidents like this.
I think my stance would be very different if he genuinely seemed ashamed, took responsibility for his fuck up and actually made a decent effort to stop the attack.
I do think she will be put to sleep though, I think it would be foolish of them not too. This is a chance to show a zero tolerance approach.
I would rather see the owner served with prison time, a hefty fine and a lifetime ban on owning any animal.