Treats possibly gave dog christels in urine

Yesterday we took one of our clients dogs to the vet as part of our service.  It turned out the dog has christels in his urine.  The client was told no more treats for a while.  She promptly asked the vet what treats she could give her dog. The previous trainer like most preached and gave treats to train the dog.  Thus the client is used to using treats and almost seems lost not giving her dog treats. It saddens me that people drink the Koolaid that is given to them. It should also be noted that a high percentage of dog food recalls is treats.  Yet they are still pushed by trainers.   .