The recent law 4235/2014 (A'32) as published in the goverment's Gazette, as well as its predecessors, 4039/2012 & 3170/2003.
Read here the latest law for pets, stray ones or legally owned ones, as well as the heavy administrative fines provided for in case you violate the law: ν. 4235/2014 (Α’32)as published in the Government Gazette. Included are the new administrative penalties and fines that replaces the table of article 21 of law No. 4039/2012.
You also need the full ν. 4039/2012 (Α΄ 15), as published in the Gazette, after n. 4235/2014 (32) is amended. The table included administrative penalties and fines as well as 5 Annexes – models (electronic identification certificate, passport or health booklet, animal adoption declaration by new owner & statement animal market).
For the record, the previous legislation ν. 3170/2003 (Α’191), as it was published in the Government Gazette.
Read here το Ν.4235/2014 : http://www.trihes.gr/wp-content/uploads/2014/03/nomos4235-2014.pdf
Read here Ν.4039/2012 : http://www.trihes.gr/wp-content/uploads/2014/03/nomos-4039-2012sm.pdf
5 examples : http://www.trihes.gr/wp-content/uploads/2014/03/Parartima-from-nomos-4039-2012sm.pdf
Read here the Ν.3170/2003 : http://www.trihes.gr/wp-content/uploads/2014/03/nomos-3170-efimerida-kibernisis.pdf