I give raw eggs often. As for the shells, supposedly the mass supermarket ones that are washed have chemicals on them that they should not have. Been meaning to look into that more as my dogs love them.
I toss Inga an egg out of the henhouse a couple of times a week onto the cement and she licks it up shell and all. She used to go into the henhouse and take eggs (egg sucking hound) But she saw a Texas Rat Snake in there (they eat eggs too) and now she won't go in there anymore.
I used bad tempered nose tagging Texas Rat Snakes to train her not to mess with snakes. The other day we came upon the garden hose in the long grass and she jumped away as if launched. Thank you, egg sucking snakes.
a Once or twice a week, shell and all. Deja knows how to crack them. For Griff I give it a crack to have a start. Otherwise I am worried he will swallow it whole. They eat the shells.
In the past I had a Shepherd mix who stole about 7 eggs a day for weeks without us knowing it until I caught him in the hen house, his butt sticking out their little door. He must have eaten them with shells and all as I never show the evidence of his morning practices and he was always healthy as well. So most of them can handle quite a bit.
I guess when they find a nest in the wild they won't eat just one either.
I give 1 raw egg every other day or so. I used to set the shells on the side for her to decide if she wants to eat or not. She used to, but now prefers not to. I'm not certain that much calcium is good for them anyway.
I give raw egg once a week. He like it. I crack a little bit when trow in his food so he eat shell to. Spike have very shiny coat. Don't know is it because of food or egg but I am giving him anyway. I heard can't do any harm and I am giving him eggs from the neighbor that have only few chicken. Not industrial. Also I am giving him organic apples (I mean from my tree without any chemicals). He eat one or two apples every day.
I'm the odd one that goes ahead and boils a bunch and stores them in the fridge. One egg a day with breakfast, shells and all. Sometimes I get bits of eggshell all over the floor but it isn't too hard to clean up. Raw egg all over the floor was a pain.
I feed raw eggs 1-2 a week depends. On rare occasions I get fresh eggs I would feed shells. Store bought eggs I don’t feed shells. The stores use chemicals to clean the shell of the egg including organic free range store bought eggs.