You made it through the first three months. You thought the worst was behind you. Then your puppy hit four months old, and you discovered what true destruction looks like. Welcome to the teething phase, where everything you own becomes a potential chew toy and your puppy acts like basic commands are a foreign language they have never encountered.
This period broke me temporarily with my second dog, a high-drive Australian Shepherd named Chase. I had survived Dash. I thought I knew what I was doing. Chase spent month five systematically dismantling my baseboards while maintaining eye contact. Humbling does not begin to describe it.
Understanding the Teething Timeline
Around four months, your puppy starts losing their baby teeth. This process continues until about six months when adult teeth are fully in. During this window, your puppy experiences genuine discomfort. Their gums hurt. Chewing provides relief. Your furniture does not care about their pain, but your puppy does not know that.
Herding breeds, already prone to using their mouths due to their nipping heritage, become particularly intense during teething. This is not bad behavior in the moral sense. This is a puppy doing what puppies biologically need to do. Your job is redirecting that need toward appropriate outlets while protecting your belongings.
Products That Actually Help
- Frozen washcloths soaked in low-sodium broth. The cold soothes gums.
- Kong toys frozen with peanut butter or plain yogurt inside
- Nylabones designed for teething puppies, not adult dogs
- Bully sticks under supervision. Watch for choking hazards when small.
- Frozen carrots. Cheap, effective, and surprisingly popular with most puppies.
The Testing Begins
Concurrent with teething comes something even more challenging: your puppy starts testing boundaries. That recall that worked perfectly at three months? Gone. The sit they performed reliably? Now optional. The crate they had accepted? Suddenly prison.
This is developmental. Your puppy is becoming more aware of the world and their place in it. They are experimenting with independence. They are figuring out what happens when they do not comply. This is healthy, normal, and absolutely infuriating.
Consistency Becomes Critical
The rules you established during the first three months need to stay the same. Your puppy is watching to see if boundaries actually hold. One exception tells them that persistence pays off. If the rule was no dogs on the couch, it is still no dogs on the couch, even when those big brown eyes are weaponized against you.
This is harder than it sounds. You are tired. Your puppy is cute. The couch is right there. But herding breeds remember exceptions. They file them away and use them strategically. Maintain your boundaries now to avoid retraining later.
Managing the Destruction
Prevention is easier than correction. Set your puppy up for success by managing their environment ruthlessly during this phase.
- Puppy-proof again. Whatever you protected at eight weeks is not enough for a four-month-old who can reach higher and think harder.
- Use baby gates to limit access. Your puppy does not need full house freedom yet.
- When you cannot supervise, crate or confine. Every unsupervised mistake teaches your puppy that chewing forbidden items is rewarding.
- Rotate toys to keep them interesting. A toy that has been available all week is boring. The same toy, hidden for three days and then reintroduced, is exciting.
When They Chew the Wrong Thing
They will. No management is perfect. When you catch your puppy chewing something inappropriate, interrupt calmly. No yelling. No punishment. Simply redirect to an appropriate item and praise enthusiastically when they take it.
If you find destruction after the fact, clean it up and improve your management. Punishing after the event does nothing except confuse your puppy and damage your relationship. They cannot connect your anger to something they did ten minutes ago. They only know you are suddenly scary.
Things You Will Probably Lose
Accept that some casualties are inevitable. Common losses during this phase include: at least one shoe, several socks, a remote control, something expensive you left within reach, and a portion of your baseboard or door frame. The goal is minimizing damage, not eliminating it entirely. Budget for replacements and keep the really important things locked away.
Training Through the Chaos
Do not stop training because your puppy seems to have forgotten everything. They have not forgotten. They are testing. Keep sessions short, keep rewards high value, and lower your expectations temporarily.
If your puppy performed a behavior reliably at three months and now performs it sporadically, that is normal. Go back a step. Make the behavior easier to succeed at. Reward generously for compliance. Build back up gradually.
Focus Areas for Month 4-6
While managing teething and testing, continue building these foundational skills. Our impulse control training guide covers these in detail:
- Recall games. Make coming to you the best thing that has ever happened. Every time.
- Impulse control. Wait at doors, leave it with food, stay with short durations.
- Leash walking foundations. This is not about perfect heeling yet. It is about not being dragged.
- Crate endurance. Gradually increase how long your puppy can settle quietly.
The Biting Escalates Before It Stops
As adult teeth come in, many puppies go through a final surge of mouthy behavior. This is often worse than the puppy biting you experienced earlier. Adult teeth are sharper. Your puppy is bigger. The pressure they can apply is genuinely painful.
Continue redirecting to appropriate toys. End play when teeth touch skin. Be consistent. This phase passes, but it requires weathering through rather than any magic solution.
Socialization Continues But Changes
The critical socialization window is closing, but exposure to new things should continue throughout this period. Your puppy is now fully vaccinated, which opens up more options.
Focus on quality experiences over quantity. One good encounter with another dog is worth more than five chaotic ones. Watch your puppy's body language. If they are overwhelmed, remove them from the situation before they learn that the world is scary.
Herding breeds can develop reactivity during this period if experiences go wrong. That genetic tendency to notice and respond to movement means a bad encounter with a bike or a skateboard can create lasting issues. Manage exposures carefully. Understanding the genetic background of your breed helps predict what situations might be challenging.
Physical Development Changes Everything
Your puppy is growing rapidly during this phase. They may seem clumsy as their body changes faster than their coordination can keep up. Exercise needs are increasing, but be careful not to overdo it with growing joints.
The general guideline is five minutes of structured exercise per month of age, twice daily. A four-month-old puppy gets about twenty minutes of walking or structured play. The rest of their energy should be channeled into mental exercise, training, and short play sessions. See our exercise progression guide for detailed recommendations.
This is frustrating for people with high-energy herding breeds. You look at this energetic puppy and think surely they need more exercise. They do not. Overexercising growing puppies contributes to joint problems that show up years later. Tire their brain instead.
Your Mental State Matters
Around month five, many puppy owners hit a wall. The novelty has worn off. The challenges have not. You are still getting up early, still managing constantly, still cleaning up messes. The light at the end of the tunnel seems very far away.
This is normal. Acknowledge it. Find support from other puppy owners who understand. Take breaks when possible. If you can afford occasional daycare that you trust, use it. A few hours away from your puppy is good for both of you.
Signs You Are Doing This Right
- Your puppy still looks to you for guidance even when testing limits
- Recovery after frustrating moments happens quickly
- Good days are starting to outnumber bad days
- You can see tiny improvements week over week
- Your puppy settles when given appropriate outlets for energy
What Success Looks Like at Six Months
By the end of this phase, teething should be complete or nearly so. The most intense destruction should be behind you. Your puppy should have a solid foundation in basic commands, even if execution is inconsistent.
More importantly, you should have a clear picture of your individual dog's personality. The puppy they were at eight weeks is not the dog they are becoming. By six months, you start seeing the real temperament emerging beneath the puppyhood chaos.
What comes next is simultaneously easier and harder. The adolescent phase begins, where your puppy's brain temporarily reorganizes itself and every hormone in their body seems designed to test your patience. But you are stronger now. You have survived teething. You can survive anything.
Continue to Month 7-9: Adolescent Chaos Begins when you are ready to learn what happens when your puppy becomes a teenager.