Loss of interest in favorite activities
Sleeping more than usual
Eating less or showing reduced appetite
Becoming withdrawn or less social
Reduced excitement when you come home
Lethargy or low energy
Changes in playfulness
Increased clinginess or neediness
Hiding or avoiding interaction
Excessive licking, chewing, or other repetitive behaviors
Changes in vocalization, such as whining or barking less
House training accidents after being reliable
Irritability or unusual aggression
Signs lasting more than a few days
Changes after a major life event, such as a move, loss, or routine change
A veterinary checkup if symptoms persist or worsen