Pug

　　Although dogs have their curiosity and want to know about everything, they also have things they are afraid of. When owners encounter these things, with professional training, dogs can overcome their fear.
　　1. Sound
　Dogs have very sensitive hearing. But sudden loud noises, such as thunder and lightning, airplane roars, firecrackers, etc., can cause some dogs to show fear. For example, tucking their tail and escaping to a safe place, hiding inside or shrinking their neck to squeeze into narrow spaces; they lose interest in food or even refuse to eat, and scolding is ineffective. As long as the sound persists, the dog’s mood cannot stabilize, and the owner’s comfort has little effect. The dog’s body will also undergo a series of changes, such as faster breathing, trembling all over, faster pulse, and increased body temperature. Female dogs shortly after giving birth may even experience tragedy like eating their puppies.
　　2. Light and Fire
　Many dogs are afraid of flashes of light and fire. Fireworks, searchlights, even the instant a match is struck while smoking, can frighten dogs. Similar to fear of sounds, this is an instinctive alert to natural phenomena. Unlike sound, when light or fire appears in a dog’s territory, it will carefully circle and bark, leading to many stories of dogs warning of fire. Some dogs strongly dislike fireworks and will stomp out discarded cigarette butts on the ground. Strengthening training related to these behaviors can equip guard dogs watching warehouses with very useful skills.
　　3. Death
　Dogs have a strong fear of death, especially the death of their own kind. The smell emitted after a dog dies serves as a strong terrifying stimulus to living dogs. Even the closest canine companions and their offspring dare not approach, showing fear with raised hackles, backing away step by step, and trembling all over. Some dogs also show fear of the smell of leather, disliking leather shoes, possibly because leather retains the scent of other animals.