What to feed my rabbits to ensure they survive the winter

[clydeserani]

Hi, I have two rabbits, one of which we are unsure of it's age. I went to let them out the cage today and the older one is barely moving. It has lost a drastic amount of weight over the past couple of days too..Last year I fed them on Rabbit pellets and Black Sunflower seeds which seemed to do them well. Is there anything else I can add to help build them up. They get lost of fresh veg daily.
I think I might bring them in for a couple of weeks. Are there particular types of Veg or other Foods that will enable them to put on fat and store it? Any advice please would be appreciated.x

[Ratty2E]

I think it needs to see a vet ASAP. If it's barely moving and losing weight that quickly it's obviously not well.

[RATTER15]

Rabbits are fine outdoors as long as they have somewhere to get out of draughts etc and they have plenty of bedding, they should be fine on ordinary rabbit food and fresh veg, however it does sound like one of your rabbits needs the vet quite promptly!

[notasyoungasiwas]

Agree with both comments above, your rabbit needs a vet URGENTLY.