What two factors define the 'best' diet custom-matched for an individual Brittany?

Digestive tolerance and activity output

Owner observations across various feeding styles—from high-protein kibbles to limited-ingredient diets—converge on one central principle: there is no universal 'best' food. Instead, success hinges on individualized assessment. The most crucial criteria for selecting and maintaining a successful diet for any specific Brittany involve closely monitoring and matching two primary variables. The first is the dog’s individual digestive tolerance, as even seemingly appropriate foods can cause issues like loose stools in sensitive individuals. The second critical factor is the dog's specific activity output, which dictates the necessary caloric and nutrient density required to maintain optimal body condition without leading to energy crashes or unwanted weight gain.