A. Hair balls are not normal in dogs, as we think of them being in cats. Hair will most definitely cause full or partial obstructions in dogs, and that's likely why you're seeing the vomiting. They don't digest well and tend to hang around in the stomach until the dog is able to vomit them out. They can certainly get so big that they can't pass and can't be vomited, and then they obstruct the dog.
The first thing is to figure out why your dog is consuming hair. Work with your vet to determine if there's an underlying problem, like parasites or allergies, and then work on resolving that. Hopefully that will resolve the hair consumption.
It's worth mentioning that occasionally licking and chewing are behavioral problems in dogs, but rule out medical causes first.
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