PLEASE HELP!!

This is a monastery - a place of quite contemplation. The louder you shout the less wisdom shall you receive.

The error message Can't locate dog.pm in @INC is pretty explicit. Either your module file is not called dog.pm in which case, change it or else your file dog.pm is not in any of the directories listed in @INC in which case either move it to one of those directories or else change @INC with use lib.

I also see, despite the lack of formatting in your post that your module doesn't use any namespace. You should probably address that. Perhaps a solid read through Simple Module Tutorial would be a good idea?