Barking and lunging on leash at dogs, bikes or joggers is usually big feelings, frustration or fear, with no escape option.
Reactivity is probably the number 1 issue in group training classes across Europe. Whole classes exist just for this, you are in very large company.
All of these are in the Pawty Marketplace, filtered to retailers that deliver to your country.
This one is safety-critical or emotion-driven. Work with a qualified force-free trainer or a veterinary behaviourist rather than doing it alone. See a veterinarian for any sudden behaviour change or sign of pain, and a qualified behaviourist in person if your dog has bitten, guards with snapping, or panics when left alone. Read our approach.
Pawty also has 99 training skills in 3-minute sessions you rate 1 to 5 paws, streaks that freeze instead of reset, and a care calendar. Free. No subscription, no paywall.