"Bitter spray" refers to a type of liquid that has a very unpleasant taste. It is used to prevent people or animals from touching or consuming something by making it taste really bad. Full definition
If they still try to chew on things they shouldn't, try bitter sprays to deter them or covering small and dangerous items like electrical cords with plastic housing. (thesprucepets.com)
Is there some sort of bitter spray for the grass like you get for fingernail biters? (housegoeshome.com)
You can run down to your local Petco or PetsMart and pick up a bottle of bitters spray. (2ndchance.info)