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The materials required for this science fair project:
- a young and an older German Shepherd
- a young and an older Labrador
- a young and an older Terrier
- a young and an older Golden Retriever
- a young and an older Beagle Shepherd
- a young and an older Poodle
(the young dogs were approximately 3 years of age, whilst the older dogs were approximately 8 years of age)
- a dog trainer
- 1 box of dog biscuits
- a high frequency sound generator. We used a Digital Function Waveform Generator which had a frequency response range of 1Hz to 10000 KHz.
- a quiet room


1. For this science fair project, the independent variables were the frequency of the sound, the dog’s age and the breed of the dogs tested - German shepherd, Labrador, Terrier, Golden Retriever and a Poodle. The dependent variable is the highest frequency of sound heard by the dog. This is determined by observing the reaction or response of the dog. The constants (control variables) are the distance of the sound source from the dog and the volume of the sound.

2. The six breeds of dogs chosen for the science project were the German shepherd, Labrador, Terrier, Golden Retriever and Poodle. One dog approximately3 years of age and another dog approximately 8 years of age, of each breed were  found for this science fair project.

3. A quite room was chosen and the high frequency sound generator was set up in the room. The frequencies chose for this experiment were 5kHz, 10kHz, 15kHz, 20kHz, 25kHz, 30kHz, 35kHz, 40kHz, 45kHz and 50kHz. (Human ears may not hear sounds beyond 20 kHz).

4. The dogs were led into the room one at a time. The generator set to produce a 5 kHz sound. The reaction of the dog was observed. If the dog barked, turned to look at the sound source, or its ear perked or twitched, we recorded that the dog had reacted to the sound. The dog was given a biscuit treat and 5 minutes rest. After that the 10 kHz sound was generated and the dog observed again. This process of testing was repeated until the highest audible sound frequency for the dog was determined. Our results were carefully recorded.

5. The process as repeated on the remaining 11 dogs and the results are recorded in the table given below.

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Complexity level:
Project cost ($):
Time required:
1 day to prepare, 1 day for the science project experiment
Material availability:
High frequency sound generators may be obtained from a physics lab or purchased. They are fairly inexpensive. The participation of many different breeds of dogs, of different ages, is required. Try asking friends and family if they have dogs that fit the p
Safety concerns:

Ensure that the dogs are handled at all times by a qualified dog trainer, to avoid being bitten/injury. It is possible that the dogs may become agitated by the high frequency sounds.