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www.reference.com/article/dog-whistle-work-af8f6fe8b8bd4770

Dog whistles exploit the difference between the hearing range of a dog and that of a human. They use a pitch that is too high for humans to hear but is high enough for dogs to hear. Longer whistles have lower pitches, so in order to get a higher sound, dog whistles use a very short tube (only about

www.reference.com/article/good-dog-repellent-2606a7410453e63d

Cayenne pepper, white vinegar, ammonia and citrus all emit strong odors that dogs dislike, making them good dog repellents. For outdoor use, sonic devices and motion-activated sprinklers can scare away wandering dogs.

www.reference.com/article/types-dog-repellents-f09c83cd285320a7

There are three primary types of commercial dog repellents, including scented repellents, Liquid Fence and ultrasonic repellents Owners also have the option to make all-natural scented repellents at home.

www.reference.com/article/make-dog-repellent-d603c9c3fcf6cf45

Chili powder is an effective dog repellent when sprinkled around the property. Chili peppers contain capsicum, which irritates the dog's skin, especially near the nose.

www.reference.com/article/whistle-20ac5a7895a0b5d5

To whistle, moisten your lips and say “ooh." Hold the tongue back, and gently blow a constant stream of air through your pursed lips. Adjust the position of your lips, and repeat the process until you create a whistling note.

www.reference.com/world-view/people-whistle-ca7ac6ede598c2b3

A study carried out at the University of Chicago surmised that people whistle to distract the brain from overload. This suggestion came from a study into the phenomenon of choking carried out by a leading Psychologist Dr Sian Beilock.

www.reference.com/article/smells-repel-dogs-2144b2161b89c24

Some dogs dislike citrus smells, avoiding orange, grapefruit and lemon peels scattered around. Dogs also avoid chili peppers because the capsicum irritates their skin, particularly their noses. Soaking cotton balls in rubbing alcohol and leaving them in an area is also effective. Dogs dislike the sm

www.reference.com/world-view/make-silent-dog-whistle-e46eb9f2eff71874

Silent dog whistles can be made from carving willow branches. The branch used should be about 3/4 inch thick and 8 to 10 inches long, cut at an angle.

www.reference.com/article/make-homemade-dog-repellent-9aed2bc80359a6c8

To make a homemade dog repellent, HowStuffWorks recommends using either citrus, vinegar, cayenne pepper or ammonia to keep dogs out of the garden. Although the citrus and pepper are safe for use in the garden, gardeners must take special precautions when using vinegar and ammonia in flowerbeds.

www.reference.com/article/can-make-homemade-dog-cat-repellent-e49e6c499be4b15a

You can use basic household items and equipment to make effective animal repellents that will keep cats and dogs from unwanted areas or activities. These repellents keep unwanted animals away without harming them. Avoid unwanted messes, animal fights and diseases with these homemade remedies.