What does a strict vegan lifestyle prohibit?

I admire someone sticking up for animals, but what is wrong with dairy products? Too extreme for me.

Everything living feeds on the living. What about plants’ rights? What do you call someone who doesn’t eat anything? Dead.

Bilbo Baggins, yes you can

Player Say what!?, it's wrong for you too, but if you find it too extreme you'll never know it ;)