To paraphrase that famous movie line, “I think YOU need a bigger boat”.

That added 60 lbs in your boat is basically dead weight even worse than if you had gained it.
Add in towing even a streamlined POD, I just don’t think many people, myself included could do that except maybe in dead calm water and for a short distance.

Towing that POD is going to involve some sort of tow rope set-up which means it’s going to move independently of your boat. I can see so many bad possible scenarios that from a solo paddler’s perspective I don’t think anyone could feel to secure on a solo wilderness trip.

I’m all for McGivering, but I just think it this case you’re really pushing the limits.
NOW if you can figure a way for that 60 lb dog to TOW that POD or at least HELP pull it, then you might be in business. ;) ;D

Maybe a smaller solo/tandem canoe where everything is together and you can still use double paddle and portage it easily might be a safer option for you.