Back then it was common to go to the local butchers and get a bag of bones for the dog to chew on. I know I was sent on many occasions and colleagues can remember doing the same. Now, apparently, animals whose diet is overly high in calcium such as Hyenas, produce white droppings. Thus from this you can work back to if a dog is given lots of bones to chew then it will have pale poo too.
Why it has vanished is equally easy to trace. Back at the end of the 80s/early 90s you had the start of the BSE scares and butchers were not allowed to give people bones for their dogs. Also, you had the increase in people buying pre-packaged meat and the subsequent decrease in local butchers throughout the 1980s so nowadays most dogs get to chew those leathery bits of preserved hide or woofo-snacks you find in pet shops meaning there are less overly calcium filled dogs around which in turn explains the decrease in the need to step around their little (or not so little) white deposits on the nations pavements.
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My dog is fed a natural barf diet of raw meat bone and veg. if he dosent get enough veg with his meat he can produce small hard white poops,easier to clean up but not good for him to pass so I try to avoid that by giving him plenty of greens
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On a serious note, we were told by the vet not to give our labradors bones, because they can splinter them fairly easily and splinters are REALLY dangerous.... I don't think it's just a case of dogs eating "Convenience" foods so much, just the fact that they can be very dangerous. shame really.
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