I have read in other lists like this that oatmeal both cooked and raw is not good. Also, the chicken chick (if you are familiar with her) says it's a NO. Just my 2 cents.
I do none of the above! LOL I've had chickens for almost 8 years and I only have 5. I muck their coop every morning and they free range in my large back yard all day. I pooper scoop the yard several times a day. No special shoes or tools or clothing. I wash my hands when needed:)
Of course they can with training and with the right breed. I have had a Border Collie that was great with my chickens and I now have an English Shepherd. Neither one had any problems with the chickens. My Border Collie was 7 years old when I got my first chickens and my ES was 2 when I adopted...
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It's not cruel since they feathers grow back and it doesn't hurt the chicken. I have clipped the wings on young birds until they learn to stay in the yard. I have not had to clip any for over a year.
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I only have 4 and always make sure all four are in the coop before I lock them up. Makes sense no matter how many chickens you have. If you have too many to count you might have too many! LOL
I don't trim wings anymore since my 4 are perfectly content to stay in my yard during the day and they are locked up at night. I have never trimmed nails or oiled legs??!! I did have one I had to bathe because of a dirty butt and she was ill.