Forcing Player to Use Item.

I need a way to simulate a right click event to have the player use a spawn egg. the problem is, the "Simulate Right Click of [entity] on Block at x: y: z:" block does not do what I need it to, and instead is only useful for making the player open a chest or whatever. If anyone knows a way to make what I need to happen, or some other work around (such as some way to summon the mob by looking at what the spawn egg is) It would be very much helpful.