Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to check a dog for a fever [title] Prepare the thermometer. [step] 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.

Ending1: [title] Insert the thermometer into the dog's ear cavity. [step] Rotate the thermometer 90 degrees so that it is on the inside of the ear canal. Ending2: [substeps] Dip the thermometer into the peanut butter and place a single layer of petroleum jelly on the tip. Alternatively, you could place your thermometer on a skewer instead. Ending3: [substeps] 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. Ending4: [title] Call your vet if you suspect that your dog may be having a fever. [step] Your vet will decide whether to change the thermometer for you or your dog.

Answer format: ending1/ending2/ending3/ending4