Instructions
Place your dog in a comfortable position, whether that is sitting in your lap or lying down. This will help your dog remain more calm while you are looking inside its mouth.
Place your thumb against the dog's jaw on one side and your other four fingers on the other side of its mouth.
Press lightly until the dog opens its mouth. Leave your hand there so that the dog will keep its mouth open. Do not press hard, as that could cause the dog's teeth to cut its cheeks.
Use a wash cloth or a paper towel and take the dog's tongue in your other hand. Lift the tongue up and look underneath it.
How to Look Under a Dog's Tongue
You likely take your dog to its veterinarian routinely to check for various things. But it's also a good idea for you to examine your dog at home from time to time. Looking at its fur, body, ears and other body parts can be simple, but checking inside its mouth and underneath its tongue can be more difficult. Check underneath your dog's tongue for any growths, blisters or other problems that you might need to get checked out.