As we're in the UK, I'm not too sure just where Houston is in Texas, but have you tried the Miniature Schnauzer Rescue of Houston, contact
Karen Coleman, Houston.(832) 277 4904. email: houstonschnauzerrescue@yahoo.com?
They may well be able to point you in the right direction for another male Schnauzer to keep Ed coompany. Sounds like he's got his paws full with all those girls...!
