Hi AC,
Unlike most Newf guardians I see designations on food bags such as "puppy", "puppy large", adult, etc. as marketing gimmicks. I assess the various feeds based on ingredients, analysis and actual testing on my Newfs.
With regard to Acana, only one product is on my Approved Food List for Newfs and that is Acana Pacifica. Unlike the Orijen products which with one exception all contain significant fish, Acana is limited to only one that I can recommend. With this in mind I would suggest that you change your puppy over to the Pacifica or to Orijen 6-Fish.
Newfondly,
Peter