The duration of the growth period

Growth is an intense building phase during which the body requires more nutrients, especially energy, proteins and minerals to grow into an adult. That's why it's essential not to switch the puppy to an adult diet too early, to avoid deficiencies, or too late, which could increase the risk of obesity. It will be important to monitor the growth, which is possible thanks to the pediatric growth curves.

When to do the transition?

• In small breeds, dogs up to 22 pounds / 10 kilograms body weight, this transition should take place around 10 months.
• In medium breeds between 22 and 55 pounds / 10 and 25 kilograms adult body weight, it should be at 12 months.
• In large breeds, between 55 and 99 pounds / 25 and 45 kilograms adult body weight, it should be at 15 months. And we'll target 18 to 24 months in giant dogs, those with an adult body weight above 99 poungs / 45 kilograms.
• In most kittens, we'd recommend switching at 12 months, and 15 months in giant feline breeds like Maine Coon.

Recent studies showed that spaying and neutering have little impact on the rate of growth, which means there is no need for dietary modification after this procedure in cats. Though studies have shown that spayed and neutered kittens might actually gain weight if they are fed a typical growth diet after the procedure.
It is therefore recommended to decrease their daily energy intake by 25 - 30% to prevent this problem.

You may also be interested in watching the following videos:

The cat gestation

The dog gestation 

Supplements during gestation

The importance of nutrition in newborns

Milk replacers for veterinarians

Growth charts in puppies

The microbiome in puppies and kittens

Weaning diarrhea in puppies and kittens