If a cat eats a stink bug, it is unlikely to cause serious harm, but it may lead to some unpleasant effects. Stink bugs, which are known for their distinct odor, are not toxic to cats, but they can still cause discomfort for both the cat and the owner. Here's what can happen:

1. Unpleasant Taste and Odor

• Stink bugs release a strong, pungent odor when threatened or crushed, which serves as a defense mechanism. If a cat eats one, the foul taste and smell could be unpleasant for them. This may cause the cat to salivate excessively or try to spit out the bug immediately.
• The odor may also linger in the cat’s mouth or digestive system, which could make the cat uncomfortable.

2. Gastrointestinal Upset

• While stink bugs are not toxic, they have a hard exoskeleton and other defensive chemicals that may cause mild gastrointestinal upset in cats. This could result in symptoms like:
  • Vomiting
  • Diarrhea
  • Drooling or excessive licking
  • Reduced appetite
• These symptoms are generally mild and should resolve on their own after a short time, but if your cat shows severe signs of distress, it's a good idea to monitor them closely.

3. Possible Mild Poisoning from Chemical Compounds

• Stink bugs produce chemicals as a defense mechanism, and while these chemicals are not lethal to cats, they can be irritating to their digestive systems. Eating a large number of stink bugs might cause more significant discomfort or mild toxicity, but this is uncommon.

4. Choking Hazard

• If the cat tries to swallow the stink bug whole, there is a small risk that it could cause choking, especially if the cat doesn’t chew it properly. This is more of a concern with larger bugs.

What to Do If Your Cat Eats a Stink Bug

• Monitor Your Cat: Watch for signs of gastrointestinal upset, such as vomiting, diarrhea, or excessive drooling. If your cat seems to be in distress, try to keep them hydrated and prevent further bug consumption.
• Contact Your Vet: If your cat shows persistent or severe symptoms, such as excessive vomiting, lethargy, or a change in behavior, it's best to contact a veterinarian. They may suggest bringing your cat in for an evaluation to rule out any complications.
• Prevent Further Bug Eating: If your cat has a habit of eating bugs, try to limit their access to areas where bugs are common. You can also use screens or other deterrents to keep bugs out of the house.

Conclusion

In most cases, eating a stink bug won’t pose a serious risk to your cat’s health. The most common effects are mild gastrointestinal upset and a temporary bad taste or smell. However, if your cat shows signs of distress or consumes a large number of stink bugs, it's a good idea to consult with a veterinarian.