Let's go through this step by step:
When calves start eating grass they also start ruminating.
Most foals don't need to be dewormed until they start eating grass on pasture; even then, provided the adult horses have been regularly dewormed there isn't much need for a foal to be dewormed. I would suggest not developing a standard program, but rather working with your veterinarian to address worming issues as needed in specific foals.
Young kids will start to mimic their mother at about two weeks of age and start nibbling on what their mother is eating.
no because their legs are to long
Eating grass is a sign of an upset stomach.
yes. Grass eating animals, or herbivores, are considered to be primary consumers
The deer would be called a consumer because its eating the grass
Foals can start nibbling on grass within a few days of birth, but they typically start consuming more substantial amounts of grass around 2-3 weeks of age when their digestive system is better developed. It is important to introduce grass gradually to prevent digestive issues.
Deers are vegetarians. It's not hard to walk up to leaves, berries, or grass and start eating.
A zebra foal will start eating grass, or at least mimic what its mother eats as young as a few days to a week old. Most of the time, though, the foal depends on its mother's milk for nutrition over the more coarser and harder-to-digest grasses of the African savannah.
no
Yes, a dog can develop bloody stool from eating grass.