Rodenticides are a very common cause of poisoning in dogs. Most rodenticides are anti-coagulants that work by causing uncontrollable bleeding. Unfortunately they have a similar effect on our pets. When a dog eats an anticoagulant rodenticide, signs of bleeding can be delayed many days. Symptoms of rat poisoning in dogs include lethargy, bleeding from gums, black tarry stools, pale gums and nose bleeds. Rat poison in dogs can cause problems with blood clotting which can last for many weeks or months. Brands such as Ratsak, Talon and Big Cheese are available in pellets or wax blocks. If you suspect that your dog may have eaten rat poison, please contact the Animal Poisons Centre or your vet immediately.