I would surmise that it is region related. But this is a fair question as we come across this issue from time to time. Only solution is to clean out the washer as much and whenever possible. it works for the most part but there will be occasions where we’re unable to get to the washers in time.
Only mitigation we have is the fact that we are at or check on our mat several times per day. Then again the area is not so rural that the animal blankets or animal beds are a regular issue.
You idea relative to a dedicated machine has merit. I would assume that you would be considering a good reliable used machine. Purchasing a new 60 lb machine specifically for that is in most cases countierintuitive.