With several graphic images floating around the web of dogs with Japanese Beetles covering the hard pallet (roof of mouth), pet parents have been naturally alarmed. The images seen online appear to be extreme cases - but these bugs can be harmful to your dog. These are NOT the average "Lady Bugs" you find in your garden.
Japanese Beetles release body fluids called hemolymph, containing stinky and poisonous chemicals. Hemolymph is corrosive and can cause chemical burns to the mouth and/or gastrointestinal tract. If chemical burns are not treated properly, an infection could develop and potentially become serious.
Some signs of a dangerous encounter with the beetles include excessive drooling or foaming at the mouth, reluctance to eat, and a foul odor coming from the mouth. The beetles may be visible within the mouth or open sores may be seen. Possible side effects after ingesting large quantities of beetles include reduced appetite, vomiting, diarrhea that may be bloody, and lethargy. If any of these signs are present, call your vet for an immediate evaluation. If the beetles have attached themselves inside the mouth, you may not be able to get them out by brushing or with your fingers. When embedded, tweezers or forceps may be needed to remove.
Be mindful of your dog's surroundings while outside, and try to keep the beetle numbers in your home to a minimum. Seal exterior cracks and entry points around the outside of your home. If you find the Japanese Beetles inside your home, vacuuming them up is typically more effective that using insecticides.