Is that the Kavarna municipality pound?
Has the whole scandal of the Vet and Manager from a couple of years ago been resolved? There were a lot of Bulgarians involved at the time I seem to recall.
If you are interested, there is a German group who have made massive inroads in turning around one of the local pounds in Romania, working with the local population and the mayor.
I don't know where this lady lives in BG but she is involved with other groups and doing some neutering campaigns https://castawaylucyirvine.wordpress.com/
It might be worth contacting her, as Animal Spay Neuter International are returning in October to do another spayathon : http://www.animalsni.org/bulgaria-june-2015
Hope everything goes well.