Duke is 4 months old and we have the pulling problem eating everything that moves in front of him if he see,s an aproching tree he pulls even harder, we,ve tried stopping and sitting. He is walked in a harness and a collar, we use this as it helps control him when he gets so excited he does a back flip. I have tried walking him without the harness and my arm ached so much when i got home it felt like it had been pulled out of socket. I don,t want to buy a halti i don,t think this will help, my opinion is that cocker spaniels are mad and i,ve got myself one thats total barmy.