We use the washable ones (from LittleBit here on YT), and they are great and save a ton of money. We had to get over the "ewww" factor at first. BUT here is one way to help with that. For those of you with children, I can guarantee you've put grosser items in the washer with babies and toddlers. My kids had diarrea and vomit that got all over everything (clothing and bedding) a lot more than my dogs have.
We just pre-rinse them and then run them through a wash cycle. To make you feel better, you can then run a small bleach cycle afterward to discinfect the washer.