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Hi. My name is***** Thank you for your question about Josie. By a small amount, was this like a dime size amount or what about? How big is she?
Ok. I would hope that this situation isn't going to be a bad one. WD 40 is oil and it is a GI irritant. It can cause decent stomach upset if enough was ingestion. It can also cause loose stools too depending on how much is consumed. Basically if vomiting starts up, then that needs to be addressed. For her size, that small amount would seem to be that much to cause vomiting.
Giving a little food may help to get some bulk to the stomach content and dilute it out some. I think a small amount of her regular food would be best.