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How to check a dog for a fever
Prepare the thermometer.
Lubricate the tip with petroleum jelly or water based lubricant such as " ky jelly. " lubricating the thermometer will make the experience slightly less uncomfortable for your dog.
If you have a digital thermometer, turn it on and make sure that it is in working order before inserting it into the rectum. Most digital thermometers can read in fahrenheit or celsius.