The hand held citronella spray collar with remote is another type of training collar. (professorshouse.com)
These devices range from water sprayers and collars with citronella sprays to audible alarms that activate each time the animal barks. (texaswestveterinarian.com)
PetSafe SprayShield Animal Deterrent with Clip, Citronella Spray up to 12 ft, Protect Yourself and Your Pets (amazon.com)