How to make 2 objects of one? I want to slice an object in Blender into two pieces, but I can not get it done. If I use the Mesh tool Bisect it doesn't slice it rightly where I want it slices how i don't want it. I want to slice all the object to get two pieces. Please give me some information how I can do it rightly or how I can use knife tool to slice it. I don't know how I can merge all the object to one object and then slice it. 

Here is what I have now


and I what to slice it to get two objects something like this



So I can move half of the dog up and half of the dog down.

When I use Bisect it doesn't slice it correctly how I want.
You can slice the object in two by using the Boolean modifier. 

Here's how to use it do to this: 
Step 1-Add a cube and scale it down on the Y axis until it bisects your object in the middle where you want two objects. 

Step 2-Add a Boolean modifier to the object you are splitting, and make sure that the operation is set to difference. 

Step 3-Make the object that modifier affects to your cube. Now you should notice in wireframe view that the object looks like it has a small breakage on both sides of the cube. 

Step 4-apply the boolean modifier and delete the cube. 
There should be a break in the object that separates it into two parts. 

Now, select the object and go into edit mode. 
Press 'P' on your computer keyboard, and select the option "separate by loose parts".

Blender has now separated the object into two individual meshes, and that should solve your problem.