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Hello, I'm Dr Gary. I've been practicing veterinary medicine since 2007. I look forward to helping with your questions/ concerns.
Crabapples are not toxic in themselves. They can cause some GI upset (nausea, vomiting) when ingested. That is probably what caused the vomiting.
The good news is that most dogs are back to normal within 12-24 hours without any specific therapy. If the vomiting is continuous, then I would treat with an anti-nausea med (Cerenia) and some fluids to help with hydration. That is not likely to be needed here.
I hope this helps, let me know if you have any other questions.