Hi.
We have a new puppy 9 months old and have never had a problem with his food until now! we feed him on Wainwright's & has tried every flavour, it was expensive keep buying small bags so decided to buy a large 75Kg bag. Now ever since he has been eating this he has been having loose bowl movements! We don't know what to do. Any help gratefully received

75kg bag?      maybe you mean 7.5kg or 15g ?.  

What flavour and  type of Wainrights have you   been trying, and which ones is he ok   on?

Why have  you been trying lots  of different ones?   Is  it because his bowels are  loose, or some other reason?

Also, how much is he having and how many times a day?   What breed is he?