Stress in pets usually shows up as behavior first. ASPCA’s anxiety guidance calls out pacing, panting, barking or howling, chewing, digging, trying to escape, and trouble settling down. Aggression can also be a stress signal if the pet suddenly stiffens, growls, snaps, or seems more defensive than usual.
Cats often hide more when stressed, while dogs may become clingy, vocal, destructive, or lose housetraining temporarily. The main clue is change: a pet that is usually social but suddenly withdraws, or a quiet pet that suddenly becomes noisy, is telling you something has shifted.
The useful move is to look for the trigger. New people, loud noise, travel, schedule changes, or being left alone longer than usual can all start the pattern. If the behavior is new, severe, or tied to pain, it is a vet question rather than a training question.
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