What is the difference between the two? Is one more fattening? I am in the process of switching my Goldens from Bil-Jac and The one dog I am most concerned about has a slight thyroid problem and he is on Soloxine. He is 3 years old and ways 130 lbs and the vet said he should loose 15 lbs He has also started with ear problems this year. It probably sounds like he is way overweight for a Golden but his mom and dad were very big dogs. I don't want him to end up gaining more weight from Innova EVO which is what I was thinking of buying. Why is the protein so high? I don't know if this food will be to rich for him and should I wean him off the Bil-jac or just make the switch? Thanks for all of your suggestions.