K-9 and Company didn't work out so well, unfortunately. It only lasted one show (probably because of the poor script). You can probably still see it on Youtube.

If you have Amazon Prime, you can watch past episodes of the Sarah Jane Adventures for free. It's sort of like Dr. Who for teens. It ran relatively recently and as I understand, could have gone longer had it not been for the untimely death of Elizabeth Sladen in 2011. K-9 is in a few episodes and 1 episode also has David Tennant making a guest appearance.

I think the best episodes for K-9 are still the classic ones with Tom Baker as the Doctor. K-9's in the ones from Invisible Enemy to Warrior's Gate.

I never got to see the modernized K-9 show, unfortunately. The Syfi channel picked up the rights and ran a marathon on Thanksgiving weekend, but I was visiting relatives that day and they didn't subscribe to that channel. I need a DVR!

Frank

You could go for a wireless one, like one of the Epson Mobilink ones. https://pos.epson.com/products/MobilinkP60?ProductPK=492