I tried to teach my dog a marker for "slow" on loose leash walks. I think he is now doing it on purpose to get the food. Are my assumptions correct in saying this will not work? Or am I impatient?

Hi,

Love your all you are doing :) I have a 13 week old puppy(Weimaraner). Things are going well with marker training. He is crate trained and we are getting there with house training. He is a soft to mid temperament. Started marker training first few weeks with his name, now he just about gets whiplash when I call his name. He's learning sit already. When we walk I made the mistake of thinking I could 'marker' train the "slow" command by marking him when he slowed and turned. But I realize now all he is doing is turning, waiting for me to catch up, getting the food and then running forward again to where he pulls the leash tight. Are my assumptions correct in saying this will not work to 'loose leash' train him? Or am I to impatient, and continue to train him marking the turn? Another option I thought was to drop the "slow" command now I have used with incorrect training and use another word, correcting him with a couple of 'pops' when the leash goes tort?

Thanks for time