PetSafe Elite Big Dog Spray Bark Collar
For another citronella spray option, PetSafe has the Elite Big Dog Spray Bark Collar, and they also offer a small dog alternative. This refillable, waterproof collar is highly rated as effective for most dogs and is powered via 6-volt battery. The way this, and most spray collars work is through a burst of citronella scented spray emitted into the dog's face when barking. This is unpleasant, but completely harmless, and the quick reaction will help deter unnecessary barking.