Thanks for the replies/info everyone.

Quote Originally Posted by pessimisaurus

so.. maybe that was it, but Id only think so if it was still damp or was recently saturated. otherwise I imagine it had had plenty of time to air out.
It was. Yes, I'm an idiot, I did not even think of it hurting him, I dipped the tag holder in it and put the collar back on. In fact I've washed the tag holder twice with soap and I can still smell it.

Nebo is a very sensitive dog, it doesn't take much to make him sick.

Just hoping this is a one-time thing.