
i would cut out the mixer bicuit part of the meal, as without it the diet seems balanced.
However, do add fish, oils, kelp, brewers yeast, fruit (a little over ripe preferably) raw eggs and yoghurt, and offal as well.
At 5 months, i would want to see the dog not carrying too much excess weight, a slight covering of fat, and i mean slight, should be fine, but not so much that you cant easily feel the ribs, or that he 'rolls' when he walks/runs (i e the extra fat wobbles).
Are u giving large raw meaty bones, as recreational bones? as these are fun, clean the teeth, and provide jaw, neck, back and leg exercise too!
Good luck
Em