Augmented Reality Game not Working on Android

We have made an augmented reality virtual pet game in Unity 3.5. Everything works just fine in the play mode of Unity. You introduce the food and the pet eats it like it is supposed to, but when you build it onto an android phone it all goes wrong. When you introduce the image target the pet seems to fall back away from the food and will not eat it. Like I said it works in play mode in Unity the right way. Does anyone have a suggestion?