Cool looking dog. There seems to be a heavy yellow-ish color cast to the image though. It is easily corrected in photoshop by:

Duplicate layer.
Filter> Blur > Average (this will give you a solid color layer over the original).
Add Levels adjustment layer
Click on the Middle gray dropper, and click on the solid layer.
Turn off visibility of the solid layer (leaving only the BG and levels layer visible.
Then you can reduce the opacity of the levels layer to taste.

With your permission, I can download one of these pictures and show you the results if you like. . .

Giovanni,
yes, that's an American Pitbull. Now, just what were you trying to do with those photographs? If you were trying to take a few snapshots of the dog, you got 'em. If you were trying to do a pet portrait, there are some issues you need to address.

1. location. The dog is hot and the lighting is poor.

2. pose. The dog is hot. His ears are back and his tongue is hanging half-way to the floor. Not very flattering.

3. baiting. The dog is looking in a lot of different directions but none of them take advantage of his best feature -- his eyes.

I'd like some text to understand just exactly what you want us to do with these photos. Are you looking for a critique?

Jim

Hey Giovanni,

Thanks for posting the photo. Pit Bulls are beautiful dogs. They just scream power - and yet, the remarkable thing is just how gentle most of them I have encountered are.

From a technical perspective, your shot needs a bit of work (as Jim metioned above). The other thing I would suggest is that you consider cloning out the leash. It is a bit distracting.

Thanks for sharing,
James