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I've been trying to create a simply low-poly cat model, but I've run into an issue. When I try to rotate around my model, it appears black at some angles, which makes modelling difficult. Here are screenshots to show what I mean:

Cat from diagonal angle. The whole body of the cat is black. This also occurs from other angles, this is just one example.
enter image description here

Cat from side view. Faces are clear, but the cats feet appear to be a brighter shade of grey than the rest its body. enter image description here

I'm fairly new to Blender so maybe I'm making a rookie mistake, I'm not sure. I've tried adding in lighting it doesn't seem to have an effect on the model, only when I set the scene to "Render" mode. Any help would be appreciated!

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In Edit Mode select everything by pressing A (You may need to press it twice). In the Tool Panel on the left (Pressing T toggles this panel on/off) select "Remove Doubles" at the bottom. Then go to the Shading/UVs tab and select Normals > Recalculate.

Recalculate

You can check which way the Normals are facing visually by clicking the Display Face Normals in the Properties panel on the right. This will display blue lines indicating the direction the Normals are facing (Pressing N toggles this panel on/off).

enter image description here

You also have some Z Fighting going on in the cats feet usually caused by duplicate faces. Indicated by the hash marks in your screen grab. If "removing doubles" didn't fix this you will need to delete them manually.

enter image description here

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Your normals are flipped, which essentially means your mesh is inside out! In edit mode, go to Mesh > Normals and flip normals. Recalculate outside sometimes works better if you have some right and some wrong.

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