Limping or favoring one leg
Reluctance to walk, jump, climb stairs, or move
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 guarding a specific area
Stiffness, especially when standing up or lying down
Trembling or shaking
Flattened ears, tense body, or tucked tail
Changes in posture, such as a hunched back
Sensitivity to touch or being picked up
Unusual aggression or irritability
Changes in bathroom habits
Excessive drooling
Wide eyes or dilated pupils
Sleeping more than usual or seeming lethargic
Facial expressions that look strained or worried
Not wanting to play or interact normally