4. Squints and Blinks
This is also a good gesture as dogs often squint and blink faster when they are enjoying themselves with you. It just loves your pats and touches. But too much of squinting can turn out as something serious. Take it to the vet. If your much older dog squints in the sun, get it checked for cataracts.
5. Showing its Teeth
When any dog shows you its teeth, often in a mildly aggressive way, it wants you to back off. Dogs can get protective of their favorite toy or their food. Showing their teeth without snarling is a warning to you. But if your dog does that too often, visit a trainer for help.