Hay: 80%+ of diet. Timothy Hay or Alfalfa hay if your rabbit is less than 5 months old. Best brand is considered to be Oxbow, but Kaytee is also a known brand in the US. People also check their local farms for pricing as well.
Pellets: 5% if adult, closer to 10-20% if younger. Again, Oxbow is the known brand and considered the best. There are two types: one for adults and one for young rabbits (6mo or younger)
Veggies (not carrots): See the link I mentioned and it will list the different classes of vegetables and how often they can be fed, based on vitamin and mineral content. Note that young rabbits should not be fed any vegetables or non-hay/pellet food until they’re around 6mo, in which case you introduce one at a time in small quantities so the rabbit’s stomach can get used to it and you can see if your rabbit reacts okay to it. Not all rabbits like/have a stomach equipped to handle all the rabbit-proofed vegetables.
Treats: Less than 5% of diet, regardless of age. These are anything high in sugar, including all rabbit-safe fruit and carrots. Do not feed many throughout the day because this will discourage hay eating, which is essential for a healthy rabbit.
There’s no such thing as a healthy pet rabbit who doesn’t eat hay.
The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.