Canon no longer supports iP4500
I had the same problem from simply upgrading to a newer MacBook Pro. Same OS X 10.10.3, and even tried installing drivers from original Canon CD, but to no avail. No Canon drivers show up, even tho I had migrated my hard drive from the earlier machine. Canon told me they no longer support my printer, which is a shame, since it has performed so admirably over the years.
I'm hoping someone has a workaround to allow me to continue using the Pixma.
I far preferred it to a Photosmart 6520 also on my network, including such benefits as direct-feed paper flow and ability to change paper source, convenience of interface, and general adaptability to the Mac apps, which for the HP product is pretty perfunctory. I have purchased many Canon printers in the past, but not sure I'll continue to do that.