Your dog should not be harmed by the experience. Stink bugs aren’t poisonous to dogs although most dogs will experience some negative symptoms after eating one. A dog that cries when touched, doesn’t want to move, isn’t eating, or isn’t as active as usual, may have been bitten. In all honesty, if a dog eats a spider (even if it is a poisonous one) it won't cause a problem. In a case of a dog bitten by a spider upon eating it, there would be drooling and oral pain, explains Dr. B, a licensed veterinarian. Three of the most dangerous spiders to dogs are black widow spiders, brown recluse spiders, and the wolf spider. There are few spiders in the USA that are venomous – and aggressive – enough to do any harm to a dog, and your pet will need the reflexes of a superhero to catch one anyway. Please don’t worry yourself. Gabrielle Wilkinson Adams is completely right, the spider is venomous, not poisonous. It may be used for testing and analysis. spider venom is not a poison and would have to be injected into the skin to be toxic. Source(s): UC Irvine, entomology. Also, if the spider was dead for awhile, the venom had likely broken down and degraded. In a dog that’s going to react to a spider bite, you may not see anything at all for 8 to 10 hours. Because spider venom contains an enzyme that triggers allergic reaction in dogs, the affected area will itch. Dogs and cats don't react to spider bites like humans, and the consumption of spiders is harmless anyway. Then, the dog will start showing evidence of severe pain, maybe with a bit of swelling. Spraying for spiders and other insects frequently can help prevent this. If the dog has vomited, gather a sample of it in a plastic bag and save it for your veterinarian. Generally, spider venom is designed to be … How dangerous a spider is varies some when considering dog anatomy versus human anatomy. While it technically depends on the size of your dog, technically it shouldn’t inflict much harm. If your dog eats a stink bug, despite the foul odor, don’t panic. The problem from spiders occurs when the spider bites and invenomates a small area of tissue. From Daddy Long Legs Myth “Is there any truth to this oft-repeated tale? The venom in the tissue can cause irritation and necrosis. There are chemicals, or aldehydes, in the stink bug which may taste just bitter and awful to your dog. What Happens if My Dog Eats a Spider? Many bites occur because of an infestation of spiders in a house, a kennel, or some other place the dog goes regularly. The spiders are poisonous when the venom is injected directly into the bloodstream. What happens if a dog eats a spider? In the digestive tract it would be broken down by digestive acids and enzymes. It’s also a good idea to become familiar with all the poisonous spiders and other animals in your area, so you can recognize them immediately. However, never induce vomiting without consulting with your veterinarian or the Pet Poison Helpline at 1-855-213-6680 first, especially if it is unconscious. You don’t need to do anything. This can be concerning, especially when the ingested spider is a venomous one and the spider has managed to bite the dog. My Dog Ate a Spider. A bite from the black widow spider—when not treated right away—will result in death. 3 …