A minor house maintenance issue.
Those plastic doorstops are, strangely enough, to jam under the bedroom door during the day when dad likes to sleep. This is to keep you out for a few hours so he can have said sleep without you doing your burrowing act. They are NOT edible. Plastic is not healthy to doggy digestion, and so you are not supposed to take it in turns to push the door open, steal the stop, and then chew it to death.
In your short life so far, you have gone through 18 of these things! The wooden ones I'm not so worried about, and the fact you haven't been ill is probably because you gnaw them apart and spit out the bits. I might add that this gives an added level to the dangers of going to the loo in the dark which I don't need.
Not everything at your head height can be eaten. I know you're rotties, and therefore almost as tough as a labradour in this regard, but please cease and desist. Or the next doorstop you taste will be covered in hot sauce, and I promise, you won't eat it!
The provider of (quite adequate) chewies.