Would be grateful for any training tips, Bailey is 9 months, obeys Leave It command for everything except horse and fox poo. If he's on lead and I try to pull him away he won't budge and gulps it down before I can take it off him, if he's off lead he's eaten it before I can get to him. Really want to try to stop this, fed up with the stinky breath and sometimes loose stools if he's had a lot.