I forgot to mention that our vet left me a voicemail yesterday regarding my request for the prescription for the pen. She basically said the same thing as the first one. Her concerns were that it is more expensive, difficult to dose accurately and an increased risk of contamination/infection. Ha! Good to know we'd probably still be in a holding pattern and using old insulin if we hadn't just made the decision to refill the vial when we did. Johnny definitely approves.