Dog Fighting

 Best Shot 1/200 4.5 ISO3200

 Shutter Speed too slow 1/200 5.0 ISO3200

 Need more depth of field 1/200 4.5 ISO3200

 Shutter Speed too slow 1/200 3.5 ISO3200

Shutter Speed too slow 1/200 3.5 ISO3200

Too dark - Underexposed 1/500 5.0 ISO3200

I had lots of issues with this shoot:

 When I turned up the Shutter Speed, the Aperture closed and so the images were underexposed. 

Turn the Shutter Speed Down to open the Aperture and the dog's were too blurred. 

It was also hard to focus as they were moving so much. The auto focus couldn't cope and manual focus was difficult as you had to guess where the dogs would move too. 

Depth of field was too shallow for most shots - how do I make this better?