There is something about fart sounds that most people find hilarious, no matter how much they try to act cultured and be disgusted. Sure enough they are disgusted by the smell, but the sound does something on a primal level that makes most people giggle.
Hence, you will find this video hilarious, however, the pooch didn’t find it funny at all! Even though he produced the fart himself, the sound was so unexpected that it frightened him! His reaction only adds to the overall hilarity. You have to see this.