I think some of it depends on what type of meat and what format it is fed in - ground, chunks etc I have found that some older dogs have problems processing some types of fat and both beef and sheep fat is quite dense and tallow type fat. Maybe parboiling the lamb removed some of the fat or changed it through cooking or removed some of the bacteria load on the outside of the meat - I think some old dogs just have a little more sensitive digestion and less ability to deal with things that aren't a problem in a yonger dog. Horse fat, chicken fat or lard is sometimes easier for them to digest. Some old dogs seem to lack digestive enymes and have a slower digestion so maybe need some probiotics to aid in the healthy functioning of their gut. Having the meat groun might help in having more surface area and faster digestion. This is just anecdotal and I'm no canine nutritionist though so.....
Bacteria was my guess, I always fed him very lean cuts of lamb and chicken (and trimed any fat) as he got older to keep the weight down. Expesive, but worth it. I also always ground the meat I serve so I could add suppliments and other goodies, otherwise smarty wouldn't eat 'em.
I also broke up the meals into three small ones, instead of his evening feast. It all worked out with some trial and error.
What I wonder is if there is good information out there for modifying BARF diets with age?
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