Liesl once swallowed a small amount of pizzle and, although she never went on to display any negative symptoms, it frightened me, too.
Usually, one pizzle would last a couple of days with her and when they reduced in size I would throw them away and get a new one out. One morning I had given her a fresh one and in no time at all I noticed that it seemed really small and that she had the entire piece in her mouth. In haste, I jumped up to go to the kitchen to offer her a swap, but when I reached the fridge for the chicken, greedy gabriella swallowed the buggering thing! I panicked and ran to the vets.
In short, there was nothing they could do (they wouldn't induce vomiting because that could cause an obstruction in the oesophagus if it got stuck on the way out and obviously they wouldn't open her up before she displayed any signs of a blockage). Vet gave me some paraffin oil to add to her food for 3 or 4 days to coat stomach/intestines just in case.
Thankfully, nothing ever came of it except I no longer use the normal sized pizzles. Instead I now use the extra long pizzles. They are ridiculous in length, smell appalling and cost about £30 but on the plus side I can relax and she can have a good chew without fear of any repercussions!
*They usually sell them at Zooplus but they're currently out of stock. New order expected beginning June.