Hey nevermind, just recovred the files in my hard disk.
You can find all the horses here :
http://sta.sh/2dibbaw6w6p?edit=1Also, as I won't be able to do the customs anymore, feel free to do by yourself if you want it. The psd files for horses and dogs can be found here :
http://sta.sh/21lzr3o0r0kb?edit=1 (click to "Download all")
Enjoy!