The dog is very common.
The main source of energy in Romania are the thermoelectric units (with coal or methane).
See the link below-tourism in Romania.
See the Yearbook of Romania at the link below.
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%).
Corn
This river is Danube.
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.
The greek-orthodox religion.