I am currently feeding my dog price choice as recommened.  But dont know how much to feed him and/or what else to give him. Heard veg and fruit but dont know how much to give him in proportions or how many meals a day.  Dont know if im reading too much into it hehe.

Please help

What size/breed of dog.. how much physical activity does he do a day? (why don't dog people do as horse people do and feed to work?)..

Rough set of examples.

9 Month old Deerhound bitch - light elegant version of her breed..

1 meal = block and a quarter + egg/veg/rolled oats

8 year old 18" terrier x staff x ?? (chunky broad in the ribs hefty little fella)

1 meal = quarter of a block.

I go by how fat the dog is, or thin - so the terrier here is a bit porky, he can put on weight on fresh air and is a 'good doer'. The Deerhound is a pup and is still growing, and does a fair bit of hurtling about, and obviously is bigger, so she gets five times the meat he gets. (The terrier currently wouldnt hurtle if you put a rocket up his bum).

THere is somewhere a ratio for how much food the dog should have according to how much he should weigh, someone will know that cos Im too hot at the mo...

Otherwise, if your dog is a bit fat (ie you can feel more than a 'thin tshirt' covering over ribs, or has no visible waist, or wobbles, has a fat tummy (Especially on a bitch, wobbly boobs) or a lot of fat on the breast bone)... then feed a little less than you think he ought to need, by eye.
If you feel hes a little thin then feed a little more.

Keep a close eye on him for a couple of weeks and see if he is putting on or losing and adjust accordingly. If he is staying the same, but evidently feeling hungry, up the veggie content a bit or feed whole carrots/apples etc as snacks so he feels fuller without much in the way of extra calories.

Thank you very much, he's a 7month old staffie, weighs around 20kilos

20kg, that's as much as one of my breed!

KC standard gives staff size and weight in the standard as:

Size
Desirable height at withers 36-41 cms (14 to 16 ins), these heights being related to the weights. Weight: dogs: 13-17 kgs (28-38 lbs); bitches 11-15.4 kgs.

Unless he is very untypical for his breed then he sounds to be fat.

The starting point for working out how much raw food to give an adult dog is to feed 2-3% of it's body weight. A puppy would be fed either 10% of it's actual weight or 2-3% of the weight it is expected to reach as an adult.

I feed my dogs raw but would hasten to add that it isn't a case of just feeding them some raw meat and that's it. A raw diet consists of the right types of meaty bones, offal, muscle meat, tripe, eggs, fish and must encompass food from a variety of species. I would suggest that you join a forum such as Britbarf (google and you will find it :) ) in order to learn how to feed a well balanced diet to your dog. I personally do not feed veg, fruit or any grains to my dogs but did research raw feeding for a long time before I made the switch :)