How do you make pet food invisible?

[RockyHorror]

As the title says. I can make a logical guess of getting a pet to eat most of it, but from what I've tried it still leaves a small amount left.

[Mr-Trainor]

I don't believe you can, why do you want to if you don't mind me asking ?
I suppose you may be able to set the moonlight to hide it, but then your room will be dark.

[Kyle]

Guessing he wants to trashproof his room

[Defocus]

Get a pet to eat it.

[Zeptis]

You use T-bone steaks I believe, and let your pet eat it before its almost completely gone, then you should have invisable pet food

[Super.willow]

You use T-bone steaks I believe, and let your pet eat it before its almost completely gone, then you should have invisable pet food

Also works with the cakes

[Zeptis]

I guess it also works with cakes.