Vitamin A, or retinol, is a collective term for naturally occurring retinoids and those carotenoids that have retinol activity, such as beta-carotene. Retinol, the pure form of vitamin A, is only found in animal products, especially liver and eggs. In vegetables, vitamin A only appears in its precursors, usually as beta-carotene. Breast milk contains a lot of vitamin A and is the most important source for a puppy. This should be considered for bottle-fed puppies.

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