Puppy milk formulas are made to be safe for newborn puppies all the way to 6 or 8 weeks of age. The reason why you can usually see that number advertised on the box is because at that age, puppies should be slowly weaned off of milk and moved to moist or even solid foods.
However, that doesn’t mean that older puppies, adult and even elder dogs cannot consume puppy milk formulas. In fact, it’s even recommended for certain adult dogs – pregnant and nursing canines included. The milk replacers are essentially calorie-dense foods, packed with essential vitamins and trace minerals, so they’re perfectly safe for adult dogs.
So, if you have:
A stressed dog who needs highly digestible food in order to recover
An elder dog who prefers wet foods
A pregnant or a nursing dog
A thin dog in need of calorie-dense food
Feel free to give them puppy milk replacers.