Interesting theory on the palatibilty enhancers, Dr Carol.
I don’t think this is the one that Aimee referenced, but here is a survey/study that could give insight.
http://www.associationofanimalbehaviorprofessionals.com/boze412010.pdf
At least 50% of my dogs diet is homemade raw, with limited (35%) kibble, but I have had no experience with coprophagia so couldn’t help there.
I found in the the following article in Can Vet, that seems to be relative to what you have asked.
“The dog should be fed a consistent, good quality
diet, high in fat and protein and low in carbohydrate,
with no treats or scraps. Diets high in carbohydrate
tend to enhance the drive to eat stool. The dry food
component of the diet should be reduced and replaced
with a high protein food. Although dry food is generally
a good diet, it has been shown clinically that the
above diet change will often lessen the drive to eat
stool. The addition of vegetable oil (increased slowly
over 7 days, to 15 mL/4.5 kg of body weight/day) is
also helpful. Sufficient food should be given twice
daily, on a regular schedule. Adding the fat and feeding
twice a day helps suppress the appetite for a longer
period, reducing this particular stimulus for stool
eating. Often, a diet change, maintained for 4-8 weeks,
may be all that is required to stop the behavior, in conjunction
with the decreasing strength of the drive as
the animal ages.”
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1680886/pdf/canvetj00575-0079.pdf
