Limping or favoring one leg
Reluctance to move, jump, climb stairs, or play
Whining, whimpering, yelping, or growling
Panting when not hot or exercising
Restlessness or inability to get comfortable
Hiding, withdrawing, or unusual clinginess
Changes in appetite or drinking
Licking, chewing, or biting a specific area
Stiffness, especially after resting
Trembling or shaking
Flattened ears, tucked tail, or tense body posture
Sensitivity to touch or being picked up
Changes in sleep patterns
Unusual aggression or irritability
Trouble standing up, sitting, or lying down
Changes in bathroom habits
Excessive drooling
Dilated pupils or a worried facial expression
Vocalizing when touched or moved
Sudden changes in behavior or energy level