Ostrich AggreSsivenesS.

[bravevline]

If a dog gets into an ostrich pen after newly hatched chicks, can and will the parents kill it?

 

[yinepu]

If a dog gets into an ostrich pen after newly hatched chicks, can and will the parents kill it?

They can... but if they will depends on a lot of factors.
If the dog has a clear escape route then the chances of an ostrich killing it become much slimmer..

Your best bet is a secure fence.. depending on the adults to guard and protect every chick from every predator is asking for trouble