We have the black ones. For stronger chewers. And we put them in the top of the dishwasher all the time. And never had a trouble. I've found that even things that don't say dishwasher safe...works for the top shelf most of the time. [Unless it's glass items] Some plastic may warp...some doesn't. [Accidental dishwasher placement from the hubby has brought on these experiments] But nothing melts on the top shelf at least not yet...and I've been trying to get him to understand things are not always dishwasher safe...for the past 11 yrs. So...I think you'll be safe. I know my KONG stated on the tag that it was dishwasher safe. So I know it doesn't hurt the black ones at all. Now...the red I would assume would be the same...I would watch when they chew it afterward. If it seems to have weakened the material used and cause it to break bits off while chewing. But...again the black version is dishwasher safe on the top rack.