Hi Claire- Most people consider large and giant breed dogs “adults” at the age of 1, however in relation to the calcium and phosphorus they can start eating foods with higher calcium levels between 8 and 10 months so that info is correct.
Regarding the Green Tea Extract, it is known to cause liver toxicity in dogs. Definitely look into it further to make sure you are making the right decision if you want to feed a food with it. Wellness CORE puppy is recommended for large/giant breed dogs, however it contains it, so its a trade off.
