Yes, it is not only safe, it is also gourmet! As bad as it may look, remember that most animals eat poop and they don't get hurt by it, specially dogs! They also enjoy sniffing butts (lol) so don't be concerned, as the diner food is not like the Eleka Poisons (that can definitely kill your pet)!
By the way poop in Marapets can be fed to your pets and they wont complain ever! :D