Citronella is poisonous to dogs. Citronella is one of many dangerous items that can be found in the home during warm weather and presents a hazard to dogs and other pets.
Other summertime items that are harmful to dogs include cocoa mulch, swimming pools supplies, fertilizer and compost piles. Cold weather products that are dangerous for pets include antifreeze, ice-melting products and rodent poisons or baits. Certain human food and medications can harm dogs. Chocolate, coffee, avocado, onions and grapes are among the foods which are harmful to dogs. Dogs can also be poisoned by household products such as vitamins, pain-killers and cold medicines.