the vet told me not to give my boxer bones unless they were from the pet shop as the bones cut her mouth - I have been giving her bones from sunfday roast for years but now have stopped - this never caused white poo.
Evidently pet shop bones become pwder when chewed
Anyone remember Expandis, two piece from eastbourne/hastings - they released a cassette called Im not waving Im drowning which was great, they were good live too