Reactivity on walks
What it looks like
Lunging, barking and spinning at the end of the lead when another dog, a bike, a truck or a person in a hi-vis vest appears. You cross the road. You walk at 6am. Eventually you stop walking at all.
Almost all lead reactivity is distance-increasing behaviour driven by fear or frustration. It is very rarely about dominance, and it is usually not aggression in the sense people mean when they say the word. The lead has removed your dog's option to move away, so the only strategy left is to make the other thing go away instead. From your dog's point of view that strategy works every single time, because the other dog does eventually walk past. That is exactly why it gets more reliable over months rather than fading out.
There are 2 very different dogs that both get labelled reactive, and they need opposite plans. The frustrated greeter desperately wants to reach the other dog, screams and pulls forwards, and settles once contact happens. The fearful dog wants distance, goes still and hard-eyed first, explodes at a set range, and will not take food anywhere near the trigger. Running a frustration plan on a fearful dog reliably makes that dog worse, so working out which one is standing in front of us is the first job, not the last.
The consult maps your dog's actual threshold distance, screens for pain (a sore dog has a much shorter fuse and lunging on a neck collar is its own pain problem), reviews equipment, and then sets a desensitisation and counter-conditioning plan run entirely below threshold, alongside a management plan so your dog stops rehearsing the behaviour daily. Where arousal is so high that no distance is workable, medication comes into the conversation, because a dog who cannot eat near the trigger cannot learn near the trigger.
Being straight with you
This is months of work, and the plan often opens with a period of not walking in the usual place. Owners hate that step. It is also the step that makes the rest of the plan possible.

