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The RSPCA lists destructive behavior (often near exits, doors, or windows), howling, barking, whining, toileting, excessive excitement on your return, and signs of anxiety before you leave, and says less common signs include trembling, panting, excessive salivation, and self-injury. The AKC says there is no one defining sign and warns that desperate, prolonged attempts to escape confinement can end in serious injury. Recording your dog while you are out can reveal hidden distress. See why does my dog destroy things when I am gone.
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The ASPCA says crate training can be helpful for some dogs if they learn the crate is their safe place when left alone, but for other dogs the crate can cause added stress and anxiety. Monitor your dog’s behavior in the crate while you are home first, and stop if your dog panics. See dog bed vs dog crate and what should a puppy sleep in.
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