Rule Clarification - cavalry and equipment

Hi everyone, been building and painting for some time now but hoping to have my first game this edition over the coming week.

I plan on playing Angmar. I've built my warg riders to all have shields and throwing spears.

If a warg is separate from the rider for any reason, will the orc keep both their shield and throwing spears?

I know there isn't a GW official model to represent this hence the question.

Any input is appreciated, thank you