I had a deaf and blind beagle that was 13, she was a handful too. Always running into stuff and stealing the other dogs toys/food. The other beagle didn't adjust to her condition well lol, whenever she tried warning her to leave her stuff alone Lucy didn't listen :lol:
If I'm not mistaken dogs ear canals are not straight like humans, meaning you could stick a Q-Tip as far as you could in their ears with no fear of damage because they make a sharp turn at the end.