Separation Anxiety in Adolescent Dogs: New Anxiety or Regression at 6–18 Months

Your puppy used to nap when you left. Now, at nine months, they are chewing cushions, howling at the door or following you whenever you reach for your shoes. It can feel as though months of progress have disappeared.

Adolescence brings changing needs, but that does not explain every difficult behavior. We are dog owners, not vets or trainers. This guide helps you distinguish ordinary teenage exploration from possible separation distress and build a manageable reset plan without pushing your dog into panic.

Why separation anxiety can appear or return at 6–18 months

Adolescence varies by dog, roughly spanning six months to two years, sometimes longer in larger breeds. A dog may look nearly grown while still needing substantial support with rest, chewing and independence.

The American Kennel Club’s adolescent puppy article describes an individual timeline that may begin around eight months and continue until about two years. It also notes increased exploration, too much freedom too soon and a second chewing phase around eight to ten months.

Meanwhile, owners may return to the office, move house or extend absences because the puppy seems older. New or returning distress may follow those changes. Age alone does not establish the cause.

Separation anxiety or teenage boredom?

Chewed belongings cannot tell you what your dog felt. Record the sequence, including what happened before and afterward. These patterns are clues, and boredom, frustration and fear can overlap.

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Our Separation Anxiety Signs guide explains the wider pattern. Quietness, eating or lying still alone does not prove comfort.

Signs to watch for

Look for panic at the door, persistent howling, repeated pacing, drooling, scratching at barriers or refusal of food specifically during separation. Self-injury and unsafe escape attempts are urgent concerns.

Notice subtle changes too: abandoning a resting spot whenever you stand, freezing near the exit or remaining watchful throughout an absence.

One sign does not provide a diagnosis. Record what you observe without labeling your dog stubborn or spiteful. Sudden changes deserve a veterinary check, even during an age when behavior commonly shifts.

Check what changed

Compare the current week with the last period your dog coped comfortably. Include the actual time alone, not just your working hours. Commutes, errands and delayed pickups can quietly lengthen the day.

Also review freedom and confinement. Access to the whole house may expose tempting rubbish or window activity. A newly closed crate may create a different problem.

Write down changes in sleep, appetite, exercise and health. “Teenage behavior” should not become a reason to overlook discomfort.

What changed?

Meet their needs before you leave

Offer an age- and health-appropriate walk with opportunities to sniff, followed by a potty break and time to settle. More intense exercise is not always better; avoid turning departure preparation into a frantic workout.

Add a brief training game, scent search or easy food puzzle. The AKC highlights mental stimulation, including food-dispensing toys and training games, as useful outlets for adolescent dogs.

Use part of a normal meal where appropriate. Begin enrichment while you are home so you know the activity is comfortable and manageable. A toy cannot make an overwhelming absence suitable.

Before you leave

Rebuilding alone time step by step

Start with an absence easier than the one that caused worry. That may mean a brief room-to-room gap or only seconds outside. There is no need to test how long your dog can endure.

Watch on camera and return before distress develops. If worry appears, come back calmly and make the next attempt easier. Do not wait for silence while your dog panics.

Repeat comfortable practice and make small, varied changes, including easier repetitions. Use our Separation Anxiety Training Plan for the detailed method.

If keys, shoes or a bag trigger worry, work on those separately using our Departure Cues guide. For younger dogs or unresolved early difficulties, revisit Puppy Separation Anxiety.

Rebuild alone time in 4 stages

Stages are based on behavior, not dates. Repeat or step back whenever needed.

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Use our Separation Anxiety Log to record duration, first worry and whether your dog rested. Missing observations stay blank.

A safe set-up while you train

Choose a dog-proofed room, suitable pen or gated area your dog already finds comfortable. Introduce changes while you are home. Check whether growing size and jumping ability have made the old setup unsuitable.

A crate is an option only for a dog who already relaxes in it, including during the relevant absence. Never shut a panicking dog inside or reinforce confinement to overcome escape attempts.

Supervise new chews, inspect them regularly and remove damaged items. No toy is indestructible. Avoid leaving fabric enrichment or unfamiliar objects with a dog who may shred and swallow them.

For damage-specific safety advice, see Dog Destructive When Left Alone.

Absences you can't avoid

Separate training from necessary workday coverage. Your dog’s current comfortable duration determines where help is needed.

Dogs Trust’s separation anxiety advice recommends avoiding absences longer than the dog can cope with and using friends, family, sitters or daycare where possible.

Trial the arrangement first. A walker may break up a comfortable day but cannot cover panic before and after the visit. Some dogs need someone present throughout the gap.

Our Care Options guide helps you organize suitable company and a backup plan.

Sample weekday for a teenage dog

This example assumes care covers absences beyond the dog’s current ability. Adjust activity, meals and potty opportunities to individual needs.

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Mistakes to avoid

Do not suddenly extend absences because your dog has reached a particular birthday. Physical growth and bladder capacity do not establish emotional readiness.

Avoid treating all chewing as anxiety—or dismissing panic as ordinary adolescence. Both assumptions can lead to the wrong plan.

Do not punish damage, use aversive collars or leave your dog to cry until exhausted. Avoid increasing exercise endlessly while overlooking sleep, discomfort or fear.

Finally, do not expect every practice session to set a new record. Comfortable repetitions are useful work.

When to get extra help

Contact your vet for sudden changes, appetite problems, altered movement, accidents or other health concerns. Get prompt veterinary help for injuries, suspected swallowed objects or dangerous escape attempts.

The RSPCA’s adolescent puppy advice recommends a vet check first when nothing seems to help, because behavior can have a medical cause, followed by behavior expertise if needed. It also emphasizes patience and avoiding punishment.

Seek a qualified, reward-based professional experienced in separation difficulties when worry persists, worsens or prevents manageable practice. Maturing may change some teenage behavior, but established separation distress should not be left untreated while you wait.

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Bottom line

A teenage dog needs suitable outlets, comfortable rest and alone-time expectations based on current behavior. Record what happens, check sudden changes with your vet and rebuild gradually. Regression is a reason to adjust support, not proof that you failed.