is he able to hold down food?
is he moving his bowels OK?
does he chew non food items?
Is he eating the same food he has always eaten and drinking water from the same source?
does he load up on water before, after or during his meal?
Does he eat dry food?
IS ANYTHING DIFFERENT :
It could be he is sensitive to the I/D and is not digesting it properly. It therefore remains in his intestine until the water brings it up. It may also be a bad batch. Try adding water to the food so it will not be too dry. Feen him very small frequent meal. No large ones. Limit the amount of water he drinks.You can give him ice to lick if he is overly thirsty. I would also try a completely different bag of food in case the one you got is tainted. If this continues you may have to go back to W/D since his body was more tolerant of it. There is a great deal of fiber in these foods and it may be too much for him.
Sometimes older dogs have metabolic issues like pancreatic, thyroid, renal, high or low blood sugar, etc. Amy of those could cause his system to find the food indigestable or bring it up with fluid. You may have to do some bloodwork to ascertain if he is dealing with any of these imbalances.
Please let me know how he is doing. If you have any further questions, I will help in any way possible.
Do not worry about that at all. I am not going annywhere.
If you have more questions or would like to discuss this further - I will always be here for you.
If he was not doing this with the w/d you need to take him off the I/D. There is a problem with his inabiity to digest this food. It is not normal to vomit water especially since you have even tried ice cubes and he cannot retain them.This can even be a pre bloat condition. Because of your boys age, he really needs to see his vet for evaluation. However, try switching back to w/d and see if this issue resolves. If it does - you will know the issue is with the food and not with your boy. I personally do not care for science diet because it contains corn and gluten and many dogs are intolerant of these grains.
You shoul try taking him off dog food completely and try cottage cheese or boiled chicken and see if he tolerates that any better.