Let's consider the Mist period (900-1160).
The Mist rose suddenly. People weren't prepared.
Then they didn't had time to collect goods and resource to survive for a long Time.
On an other hand, we Can assume that animals were in small herds in villages : cow, sheeps, horses, dogs, Cats, etc. For no village lives on it's own by rising livestock. They buy when the herd is low, sell when it's high, etc. And dogs, Cats, and so on are on their own.
Then during the Mist, as these animals were immune to it, they grew free and wild on the Land.
I consider that they are plenty horses, dogs, cows, etc. In ravenland, but most are wild and untamed.
This tells us that during the Mist, many people certainly grew vegetarian by need, if they hadn't chicken or fish to catch.
For example, in the Hollows, they hadn't any animal to grow. Maybe some horses, but not to be eaten, more to be mounted. Then not enough to make them give birth to other in order to make sustainable way of life... During 300 years.
That's an interesting fact about the culture of the people right now in ravenland, and how the Mist did influence it.