Your puppy was doing so well. A full week, maybe a month, with no accidents. Then out of nowhere, a puddle by the door — or three of them this week alone. If you’re wondering what went wrong, the honest answer is usually: nothing did. This is called potty training regression, and it happens to most puppies at least once.
Here’s what’s actually going on, when it tends to happen, how to tell a normal setback from something that needs a vet, and the reset plan that gets most puppies back on track within two weeks.
What Potty Training Regression Actually Is
Regression is when a puppy who was previously reliable — going days or weeks without an indoor accident — starts having accidents again. It’s not a sign that the original training failed or that your puppy has forgotten anything. It means something in their routine, body, or environment has changed faster than their habits have adjusted.
Sniffspot’s community survey found that over 50% of puppy owners report at least one regression period, and the rate is even higher during the classic adolescent months. It is the norm, not the exception.
The Two Predictable Regression Windows
Most regressions cluster around two ages, and knowing which one you’re in helps you respond correctly instead of panicking.
| Window | What’s driving it | What it usually looks like |
|---|---|---|
| 4–6 months | Teething (losing baby teeth), a bladder that’s outgrown the old schedule, first wave of adolescence | Accidents appear after weeks of reliability, often tied to chewing/discomfort or a schedule that hasn’t been updated as bladder capacity grew |
| 7–9 months | Adolescent boundary-testing, hormonal changes if not yet spayed/neutered, increased independence and distractibility | Puppy “knows better” but seems less motivated to signal or wait, especially during exciting or distracting moments |
Both are temporary in the vast majority of cases. Neither means you need to start house training over from scratch — you’re reinforcing an existing skill, not teaching a new one.
Recalculate Your Puppy's Schedule
Bladder-hold time changes fast in this age range. Get an updated daily potty schedule based on your puppy's current age.
Get your schedule →Behavioral vs. Medical: How to Tell the Difference
This is the most important call to make correctly, because the fix is completely different depending on the cause.
| Behavioral regression | Possible medical cause | |
|---|---|---|
| Onset | Gradual, or tied to an obvious trigger (new schedule, move, teething) | Sudden, with no clear trigger |
| Pattern | Accidents mostly follow missed triggers (skipped break, long gap) | Frequent, small accidents; may happen right after coming back in from outside |
| Other signs | None — puppy otherwise seems normal | Straining, crying while eliminating, blood in urine, drinking more water, lethargy, appetite change |
| What to do | Reset plan (below) | Vet visit — rule out a UTI or other cause before assuming it’s training |
If you’re not sure which category you’re looking at, the safe default is a quick vet check — a urinalysis is inexpensive and rules out the most common medical cause (urinary tract infection) in one visit.
The Reset Plan
Once medical causes are ruled out or were never suspected, most regressions respond to the same core reset — going back to the structure that worked initially, not a whole new method.
- Recalculate the schedule for their current age. A bladder-hold time that was accurate two months ago is too long now. Use the potty training calculator to get an updated number rather than guessing.
- Increase supervision, temporarily. Most “random” accidents happen out of sight. Go back to tethering your puppy to you or using baby gates to keep them in view during the reset period.
- Clean every accident with an enzymatic cleaner. Standard cleaners can leave a scent trail that draws a puppy back to the same spot, even after the visible mess is gone.
- Reward every single outdoor success again, even though your puppy “already knows this.” Consistent, immediate praise re-establishes the association faster than waiting it out.
- Don’t punish accidents found after the fact. It doesn’t teach anything except to hide from you, and can add stress that makes the regression last longer.
- Give it a full 1–2 weeks before judging progress. Most behavioral regressions resolve in this window with consistent management. If it’s dragging past 3 weeks, that’s the point to loop in your vet and consider a certified trainer.
What Regression Doesn’t Mean
It doesn’t mean your puppy is stubborn, that you’ve done something wrong, or that you need to abandon your current method for a different one. It also doesn’t reset the clock on a puppy’s overall progress — a puppy who was 90% reliable and hits a two-week rough patch is still further along than one starting from zero. Toy and small breeds in particular tend to have a longer road to full reliability in general (often 9-12 months rather than 6-8), so a mid-training rough patch is expected, not a red flag.
This article is for informational purposes only. If accidents are sudden, frequent, or accompanied by straining, blood in the urine, or other signs of illness, see a vet before assuming the cause is behavioral.
Frequently Asked Questions
Is it normal for a potty trained puppy to start having accidents again? Yes, very common. Most puppies go through at least one regression phase, typically between 4-6 months and again around 7-9 months. It doesn’t mean training failed or that your puppy “forgot” — it usually means their routine needs to catch up with a change, whether that’s growth, teething, or something in the environment.
Why do puppies regress in potty training around 4-6 months? This is when most puppies enter adolescence and lose their baby teeth, both of which can disrupt established habits. Teething discomfort, a growing bladder that’s outgrown the old schedule, and typical adolescent boundary-testing all overlap in this window, which is why it’s such a common time for a temporary setback.
How long does potty training regression usually last? Most regressions resolve within 1-2 weeks of returning to a strict schedule and closer supervision. If accidents continue beyond 3 weeks despite consistent management, it’s worth a vet visit to rule out a medical cause and consider working with a certified trainer.
When should I worry that accidents are medical, not behavioral? See a vet if the regression is sudden and dramatic rather than gradual, if accidents come with straining, blood in the urine, increased thirst, changes in appetite, or lethargy, or if a puppy who has been consistently reliable for months suddenly has frequent accidents with no change in routine. Behavioral regressions tend to have an identifiable trigger; medical ones often don’t.
Should I punish my puppy for regressing? No. Punishing an accident found after the fact doesn’t teach anything except to associate you with unpredictable punishment, which can make a puppy start hiding to eliminate rather than stopping the behavior. Treat a regression as a signal to add structure back, not as disobedience to correct.
Can teething cause potty training regression? Yes. Puppies lose their baby teeth and grow adult teeth mostly between 4 and 6 months old, and the discomfort, mild stress, and disrupted routines that come with heavy chewing and teething can spill over into other trained behaviors, including house training. This is one reason the 4-6 month window is such a common regression point.