Hi
What weight is he & how old ?
I know some of you think 100grms is not a lot per day but Amy my 10yrs old who is light framed only has 100grm per day & is not under weight & is very active doing agility & has loads of energy.
Poos that start off ok then go sloppy tend to imply over feeding if he has an intolerant to the food then they would be loose all of the time thats the experience I have had with one of mine.
I changed Jodie who does have an intolerance to Millies Woolfheart Riverside which is duck & trout as I have been advised duck based food is better for intolerance as dogs have not been exposed to duck.
The results have been amazing Jodie has normal stools & is less windy than before on her Royal Canin sensitive diet has put on weight she needed to
& I have had to reduce her food to around 100grms per day as she was getting a bit over weight
she is a little dot tho only 8.5kg
Some of the better quality foods do require you to feed less I would speak to Eden who you are with now & ask there advice Millies Woolfheart people were so helpful with my problem