Springer vv Cocker in a nutshell......
"hey Springer, charge into that bramble bush & see if there is any game in there"
(Springer) - "Yes sir, with pleasure," (bash, smash, crash). "No, nothing in there."
"Hey Cocker, charge in to that bramble bush & see if there is any game in there"
(Cocker) "Erm, no need. I can smell from here there's nothing in there. I'lle give it a miss if you don't mind".
"Get in that bush Cocker, I command you!"
(Cocker) "Erm, you're obviously not hearing me. I have a far superior nose to you - I am standing 6 feet away from the bush & I'm telling you there's nothing in there, no point me getting all scratched up because you're a plumb who can't read me."
"GET IN THERE NOW!!!!!"
(Cocker) "Right, that's it. Idiot. I tried to play nice. I am NOT ONE of your commando Springers, I am a very refined dog with a highly tuned personality. If there was any game in that bush I would know about it and I'd have flushed it with pleasure. You screamed at me. I am NOT a SPRINGER. And for that, up yours. I'm going home. Forget taking me out training for a month because we're not buddies no more."
The Springer does it because you tell him to.
The Cocker does it if he thinks it's a smart thing to do.