I'm so glad it didn't come back as definitely being an osetosarcoma. You're definitely making the right choice for your girl, this way you're minimising the risk of any spread if it is actually malignant, as well as alleviating her pain. Still, not an easy choice to make:( Although I haven't had any personal experience, I've heard they take a little longer to adapt to the loss of a front limb, as they carry more weight than the hindlimbs, but once they've worked it out they do just fine:) Will be thinking of you and Delilah tomorrow and keeping fingers crossed that all goes smoothly:)