eek, just saw this.
Some Dracaena plants are toxic to cats. Dracaena marginata - Madagascar Dragon tree - is poisonous. We found out the hard way when my cat ate some leaves of one and got very sick and hospitalised. She was fine in the end, but had to spend a night in Kitty Hospital on a drip.
It's not on all toxic plant lists but our vet found out it was toxic, when we told him what the cat had eaten.
Same cat also ate fragments of conkers and got sick, she was very greedy and obviously not very bright...
please keep the dragon plants out of Noah's way!