01/09/2026
Your puppy coped with it yesterday. So why are they struggling today?
Maybe they walked past another dog perfectly well yesterday, but today they’re barking, pulling, or finding it difficult to listen.
Or perhaps visitors were absolutely fine at the weekend, but today someone arriving at the door feels like a much bigger deal.
It can be tempting to think, “But you can do this. You did it yesterday.”
The important thing is that the same situation doesn’t always meet the same dog.
Sleep, excitement, frustration, novelty, worry, play, visitors, a busy walk, and everything else that’s already happened can all affect your puppy’s level of arousal.
Arousal is simply the level of activation in the brain and body. I like to think of it a bit like a volume dial.
As that dial goes up, behaviour can become quicker, bigger, and harder for your puppy to regulate.
And it isn’t only frightening or stressful experiences that count. A puppy can have a brilliant, exciting morning and still reach the point where their nervous system has had quite enough.
Lots of little experiences can also add up. This is often called trigger stacking.
So when your puppy suddenly struggles with something they managed yesterday, it can help to zoom out and look at the whole day.
Have they slept well?
Have they had visitors?
Have they been somewhere new?
Have they had lots of exciting play?
Have they been frustrated or startled?
Has there simply been a lot going on?
Sometimes the most useful question isn’t:
“Why are you doing this when you know how to behave?”
It’s:
“What might be making this harder for you today?”
You may decide to create a little more distance, choose a quieter route, shorten the outing, help your puppy disengage, or simply give them the chance to rest.
That isn’t your training going backwards.
It’s responding to the puppy who is actually in front of you today. 💛
I’ve written more about arousal, trigger stacking, sleep, and why behaviour can change from one day to the next on the blog.
I’ll pop the link in the comments.