Its been a few weeks and i been trying out some stuff too. But i have to come to the conclusion that a dog who's given a 20-30% of his water in the morning weighs more at weighing time then when adding that same water to the rest of it, together with the meal, after the training. There was only 8-9 hours between giving water in the morning and training time and the dog had only 1 moment(30 minutes though) to empty instead of 3. So i stopped doing that and started giving it all together. I think u also have to take in mind the temperatures. A dog who is trained in 15-20 degrees celcius will obviously lose more water then one trained in 5 degrees celcius. So its not like 1oz is a standard for everybody. Here its around 5 degrees celcius at this moment, im adding 20 oz of water to the raw, which has like 10 oz, so 30 oz all together for a 41 lb dog after 30 minutes of millwork. Will increase the intake a little together with the food as the work gets harder. I will also try to give the same training for 3 days with the same amount of food, adding like 0,7 oz per lb one day and 1 oz per lb the other day and see if there is any significant differences at weighing time. It would be a shame if you think your dog is on weight while its to wet and u end up coming like 100-200 gr under.