My collie is well trained, lives in the house with us and is a really smart dog. I let her in the room with the chicks when I tend to them and she goes in first and sticks her head in the brooder. So I start from day one. She will let the chicks (when older) snuggle in her fur and she still lets the big chickens lay next to and on her. I think she actually likes it.
A lot depends on the nature of the dog and the training. With all that said, you can never 100% trust a dog (predator) with chickens (prey).
A lot depends on the nature of the dog and the training. With all that said, you can never 100% trust a dog (predator) with chickens (prey).