Technically DOs can choose any specialty. The problem is training of DO and MD are a bit focused differently as I undestand.
It is statistically more difficult for DO to become neurosurgeons etc. My understanding that DOs will need somehow look for ways to get some training in areas necessary to get to specialist residencies. That is why generally it is not recommended to look for DO if you want to get to highly competitive specialty.
There is some old perspective from people that DO are lesser doctors. It is not true. Also DO and MD share residency for many years now (merged in 2020).
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