Sheila wants to compare her resting heart rate (number of heart beats per minute at rest) with her target heart rate. her target rate is

Heart rate or pulse is the number of times a person's heart beats per minute. Normal heart rate varies from person to person, but a normal range for adults is 60 to 100 beats per minute. A normal rate of the heart relays on the persons medication use and even air temperature, age, body size, heart conditions even the person is sitting or moving and emotions can affect heart rate.        

again, you should probably take him to the vet. goodluck