I am really struggling to get our 8 month old terrier to walk nicely on the lead. He is frantically pulling and panting and desperate to get into everything. We’ve tried stopping, redirecting, about turning and going the opposite direction (and this point he just sits down!) any other suggestions? It’s getting to the point I rather reluctantly take him out on the street and park and much prefer to book a secure dog field and let him run around but I want to be able enjoy walks!