Why Can My Puppy Cope One Day and Struggle the Next?

Emma Badger Author

Why does your puppy cope one day and struggle the next? Learn how arousal, sleep, stress, excitement, and daily experiences can change behaviour.

Yesterday, your puppy walked past another dog without a problem.

Today, they barked, pulled towards one, and seemed completely unable to listen to you.

Or perhaps they happily greeted visitors at the weekend, but today somebody arrived at the door and your puppy disappeared behind the sofa.

It can be confusing.

If they could cope yesterday, surely they should be able to cope today?

Not necessarily.

One of the most useful things we can learn about our dogs is that the behaviour we see in one moment doesn’t happen in isolation.

What has happened before that moment matters too.

THE SAME SITUATION DOESN’T ALWAYS MEET THE SAME DOG

Imagine two almost identical walks.

Same route. Same puppy. Same dog appearing on the other side of the road.

On the first walk, your puppy has slept well. The house has been quiet. They’ve had a fairly uneventful morning and have wandered out of the door feeling relaxed.

On the second, they woke early. The delivery driver knocked at the door. They had an exciting play session. Somebody came to visit. They chased a pigeon in the garden and then you headed straight out for your walk.

The dog across the road may be exactly the same.

Your puppy isn’t.

Their brain and body have already had a very different day.

And that can change what they’re able to cope with.

WHAT IS AROUSAL?

In behavioural science, arousal describes the level of activation within the brain and body.

You can think of it a little like a volume dial.

As arousal increases, emotions and behaviour can become louder too. Behaviour may happen more quickly, more intensely, or become more likely.

Importantly, high arousal doesn’t necessarily mean a dog is frightened or unhappy.

A dog can become highly aroused because they’re:

• excited
• playing
• anticipating something wonderful
• frustrated
• worried
• frightened
• chasing
• meeting somebody they love

That’s one reason it can be misleading to divide everything that happens to our dogs into simply “good” experiences and “bad” experiences.

A very exciting experience can still leave the nervous system highly activated.

EXCITEMENT COUNTS TOO

This can catch puppy owners by surprise.

Imagine your puppy has spent the morning:

playing with another puppy, greeting your neighbour, exploring a new place, chasing a ball around the garden, and investigating several fascinating new smells.

Nothing unpleasant has happened.

They may have had a brilliant morning.

But their nervous system has still been doing an awful lot.

Then somebody walks past the window and your normally fairly sensible puppy explodes into barking.

It’s easy to focus entirely on the person outside.

But the person outside may simply have been the final thing in a very busy morning.

This is one of the ideas behind what is often described as trigger stacking. Several experiences accumulate before something that might normally be manageable suddenly feels much harder.

The individual experiences don’t even need to be dramatic.

Lots of small things can add up.

YOUR PUPPY HAS A MOVING STARTING POINT

Arousal isn’t fixed.

It changes throughout the day.

Your puppy may start from a relatively calm place, become increasingly activated through play or excitement, settle again after a good sleep, and become more aroused later when something unexpected happens.

Dogs also differ enormously from one another.

Some naturally tend towards a fairly low level of arousal. Others seem to live with their internal volume dial set a little higher and may find it harder to come back down after something exciting.

Age matters too.

Puppies are still developing the skills involved in emotional regulation and decision-making. Adolescence can bring further changes, which is one reason a young dog who seemed to be progressing beautifully can suddenly appear rather less predictable for a while.

It doesn’t necessarily mean anything has gone wrong.

Development isn’t a straight line.

SLEEP CAN CHANGE THE PICTURE

Sleep deserves a special mention because puppies need a lot of it.

Rest isn’t simply a break from learning. It’s part of learning.

A well-rested puppy generally has more capacity to process information, cope with frustration, regulate their behaviour, and respond to what’s happening around them.

An overtired puppy may look very different.

You might see:

• more biting
• barking
• frantic behaviour
• zoomies
• difficulty settling
• poorer concentration
• bigger reactions to relatively small things

Sometimes the puppy who appears to need more exercise actually needs less stimulation and more sleep.

This is something we explore in much more detail in the Calm & Confident Puppy Course, because understanding sleep, stress, arousal, and development can make everyday puppy behaviour feel much less mysterious.

WHAT DOES THIS MEAN FOR TRAINING?

It means we need to train the dog who is in front of us today, rather than the dog we expected to have.

Suppose your puppy usually copes comfortably with watching dogs from ten metres away.

If they’re tired, excited, or already highly aroused today, ten metres may suddenly be too difficult.

We could keep asking for the same thing because “they can normally do it”.

Or we could notice what they’re telling us and make today’s version easier.

That might mean:

• creating a little more distance
• shortening the outing
• choosing a quieter route
• allowing time to sniff and decompress
• helping them disengage rather than continuing an interaction
• ending a training session earlier
• prioritising rest afterwards
• deciding that today simply isn’t the day to practise something difficult

That isn’t lowering your standards.

It’s setting your puppy up to succeed.

WE’RE BUILDING SKILLS, NOT JUST MANAGING MOMENTS

Of course, the long-term goal isn’t simply to avoid anything that raises arousal.

Excitement is part of life. So are novelty, frustration, unexpected events, and occasionally difficult days.

What we want to develop is a puppy who gradually becomes better able to move between different levels of arousal.

They can get excited and come back down again.

They can notice something interesting and disengage from it.

They can experience mild frustration without immediately becoming overwhelmed.

They can recover after something surprising.

Those underlying skills are a big part of what we work on in the Puppy Life Skills Programme. Rather than focusing only on outward behaviours, we build concepts including calmness, disengagement, optimism, frustration tolerance, and arousal regulation.

And because development doesn’t stop once the early puppy stage is over, the Puppy Development Pathway continues those foundations into adolescence, when changing brains, bodies, and experiences can make familiar situations feel different again.

LOOK AT THE WHOLE DAY, NOT JUST THE LAST FIVE MINUTES

When your puppy suddenly struggles with something they appeared perfectly capable of yesterday, it’s tempting to concentrate on the behaviour that just happened.

Instead, try zooming out.

Ask yourself:

What has today looked like?

How much have they slept?

Have they had visitors?

Have they been somewhere new?

Have they had lots of exciting play?

Has something worried or startled them?

Have they been frustrated?

Have there simply been a lot of things happening?

You may not always find an obvious answer.

Dogs are living, changing individuals, and behaviour is influenced by far more than we can see from the outside.

But asking those questions helps us move away from:

“Why are you doing this? You know how to behave.”

and towards:

“What might be making this harder for you today?”

That change in question can completely change how we respond.

PROGRESS DOESN’T HAVE TO LOOK THE SAME EVERY DAY

If your puppy coped yesterday and struggles today, your training hasn’t necessarily gone backwards.

You may simply be asking the same question of a puppy whose brain and body are in a very different place today.

Give them a little more space. Make the situation easier. Let them recover.

Then try again another day.

Good training isn’t about making your puppy perform at their best every time.

It’s about learning to recognise what they’re capable of right now, supporting them when things are harder, and gradually building the skills that make more of those situations manageable in the future.

Categories: : Understanding Your Puppy