Sure, but illness and disease do not equal behavior problems. I was told that behavior problems like the ones I was experiencing (overstimulated, extreme reactivity) in my puppy (vaccinated once at 8 weeks at that point) were never seen in unvaccinated dogs. This is a rather extraordinary claim that requires evidence, I have a hard time believing that my dog would have been totally normal if I had skipped that first round of puppy shots. Yeah, Wellness Core is not ten years old. Ten years ago, just plain old Wellness was the best kibble anyone could recommend, which was my entire point. Kibble has gotten a lot better. My dogs eat Orijen and Acana now, those were not available a decade ago. At this point I don't think Wellness even makes anything Brisbane can eat. Have I mentioned my rawfed dog with all the allergies? Prey-model raw from early puppyhood? Wide variety of high-quality protein sources? Allergic to poultry, eggs, and pollen?