Provided is an intraoral retaining agent for animal use having an excellent effect in terms of intraoral retention of an active ingredient. The intraoral retaining agent for animal use is characterized in that an intraoral retaining agent for animal use that is used together with an active ingredient for improving the intraoral environment of an animal and retains the active ingredient inside the oral cavity comprises beeswax and a vegetable oil and has a beeswax content of 0.1 to 29.9 wt%.