is Gentamicin not an antibiotic for gram negative bacteria? I believe it is...I was told by my vet, by Marhall Farms also, that Gentamincin nor Gentacin, should NEVER be given to ferrets as it can cause deafness. ER even had a special on how gentamicin had caused deafness in one of the lead characters babies to get the word out on it's risks Wolfy Please visit: http://www.geocities.com/wolfysluv/ For information on deafness in ferrets: http://www.geocities.com/wolfysluv/deaf.html [Posted in FML issue 3182]