[SoCalEngr]

Has anyone found a website or resource that lists specific nutritional requirements (e.g., #-of-calories, amount of protein, amount of specific vitamins, etc.)? Ideally, it'd also have this information by age/activity-level.

 

[Tagrenine]

I usually use NRC guidelines, but I couldn’t find a good NRC chart online short of buying the actually book. This is from the European equivalent.

http://www.fediaf.org/component/attachments/attachments.html?task=attachment&id=77

 

[aesthetic]

Here's the NRC chart (per Merck): Nutritional Requirements and Related Diseases of Small Animals - Management and Nutrition - Merck Veterinary Manual

They have a chart for puppies after weaning age and a chart for adult maintenance

 

[Otter]

Google: Rhonda Hovan Slow Growth
Might have the info you are looking for.