Which species has the narrowest respiration rate range?

• A. Cat
• B. Dog
• C. Rabbit
• D. Ferret

Answer: (D)

Breathing rate variability across species helps clinicians know what to expect as normal. Some species show a fairly uniform resting rate across individuals, while others swing widely with stress, activity, or environment.

Ferrets tend to have a relatively consistent resting respiratory rate across different individuals, so the range is narrow. Rabbits, by contrast, are highly sensitive to stress and can exhibit large changes in rate with fear, pain, or environmental factors, leading to a broad range. Cats and dogs also show more variability due to differences in size, breed, age, and activity level.

So, the ferret has the most stable, least variable resting respiration rate, making its normal range the narrowest.