Hello. Thanks for writing in. My name is***** and I would be happy to help you. The biggest concern at this point would be a gastrointestinal obstruction caused by eating the targets, not necessarily because they are toxic. In addition, if there are some intact shards of the target, it can cause a perforation of the gastrointestinal tract. I would monitor for any vomiting, bloody stool, further lack of appetite and/or abdominal pain. If you notice 1 episode of vomiting tonight, I wouldn't be too concerned, but if vomiting continues tonight, or he seems to be painful in the abdomen and cannot get comfortable, I would have him evaluated by your nearest emergency vet immediately. If he remains stable through the night, but still won't eat or starts vomiting/having bloody stools; I would definitely bring him in to be seen. Please let me know if you have any other questions or concerns before rating. Hope this helps.
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