We have an elderly cocker spaniel who is old and grumpy. We have taken her and my daughter’s mini sausages on holiday together with the rest of our family including our 11 year old GS.
We NEVER left any of the dogs unattended and the minute any of started to misbehave they were shunted tout de suite into one of the owners bedrooms!
ALL dogs can bite hard, big or small, young or old, and it’s 100% the owners responsibility to keep their dogs under control at all times.
If we have guests to our home who don’t like dogs, for whatever reason, we give our dog/s a good long walk, off their leafs if possible, then contain them in a room, with water, toy and chews, when our guests arrive and only let out for wee breaks or when the guests leave.
These PiL are totally irresponsible, I’d be livid!