The best way i trained my OH not to leave stuff around within reach of Zeus when he went out was the day when i went to work early and he went out to visit a mate later in the day.
He forgot to put the packet of toilet rolls away and as i came home first i was greeted by bits of toilet rolls everywhere.
I salvaged what i could, (complete with teeth marks and slobber),and told him that he would have to use them to wipe his a**e with as he couldn't remember to put the bloody things out of the dogs reach.
He never forgot to put things out of Zeus's reach after that.
If you think dogs can't count, try putting three dog biscuits in your pocket and then giving Fido only two of them. ~Phil Pastoret