Liz Buchanan BVSc MRCVS
Keymaster
Hello! There are some clear chemicals that might be injected into an iv during euthanasia. One is a flush; simply fluid (such as is found in fluid bags) with some anti-coagulant in it, used to check that a cannula is patent. If for any reason the end of the cannula has slipped out of the vein, injecting pento could be painful, so a water test shot can avoid the risk of causing unnecessary pain. It can also help to dislodge any mini clots that have formed in the cannula and help the injection to be smoother, so I would routinely flush before giving most IV drugs. Another clear substance might be a sedative, something like Ketamine / Diazepam combination, to help relax an animal and help the procedure to go more smoothly, especilly if I thought there was any chance that the experience might be distressing. If this is somehing you have witnessed, it ought to be absolutely ok to call the vet and ask them to clarify what the syringe contained.
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