Depending on your nationally for some visa extensions it's possible to use an affidavit of income in lieu of seasoned money in a Thai bank account. U.S. and Australian are the two I'm aware of.
I'm hoping Soi Dog collects strays and has them vaccinated, tested for rabies and has them spayed or neutered and not just feeds them so they can make more stray dogs.
I haven't done one at Chang Wattena for years but at Ubon it's just the income affidavit notarized by the U.S. embassy or consulate in Chiang Rai, 2x each of copies of all pages of my passport, yellow and blue tambien baan books, departure card, my wife's ID (because our house is in her name) and 5000฿ for a one year multiple entry retirement visa.
A retirement visa is a lot less complicated than a visa based on marriage to a Thai. If you have a US passport it's even easier, just get a income affidavit notarized and you don't need to season 400k for months in a Thai account at 0,01% interest.