Sorry housemartin for not coing back to you sooner but had internet problems.
In answer to your question many transport companies allow pets to be transported if on a bus they will go in the luggage hold on the bus but hav to be in a cge likewise on a train but on the train will be with you at all times.
I suggest that you contact the local bus companies in the mersin area as well as the railway company to verify this.
Travel to your destination is no problem, make sure you have the dogs medical card with you and up to date with vaccinations.
There are to many companies who travel to your destination therefore it is easier for you to either visit the local bus or railway company or via the internet, i hope this helps.