The dog is very common.
The main source of energy in Romania are the thermoelectric units (with coal or methane).
See the Yearbook of Romania at the link below.
See the link below-tourism in Romania.
The president of Romania is Traian Băsescu. The prim minister of Romania is Victor Ponta.
As far as I could find using goodsearch.com, no, there is not an animal called an oster anywhere, much less in Romania.
Romania's main denomination is Orthodox Christianism (87%), followed by Roman Catholicism (5%) and other denominations (8%).
This river is Danube.
Corn
Yes. They are called motorways in Romania. There are four main motorways in Romania; A1, A2, A3, and A4.
Sheeps and dogs, sparrows
The dragon is the main animal.
Textiles is the most important product for export.