I know mastiff owners that feed a raw diet, but personally feel that if it isn't done properly, it shorts the dog nutrient wise, especially the large and giant breeds.
You really want to feed large and giant breeds properly....not too much when they are young; don't starve them, but don't feed them do much that their are overgrowing their bone and frame development.
On the other hand, as they reach mid- life, you want to be feeding them the foods that promote joint longevity.
I would stay away from most of the Hills products except for their food that is for dogs that are prone to forming kidney stones from a high purine diet, it is good stuff.
We've had mastiffs off and on for the majority of the last 25+ years and even though they have had a recall, Blue Buffalo was giving us good results and healthy "kids".
Our last mastiff weighed a tad over 270# and he was as agile as most hunting breeds.
There are 3 loves in my life: my wife, my English mastiffs, and my weightlifting....Man, my wife gets really pissed when I get the 3 confused...
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