I've trolled around furaffinity etc a fair amount looking for good diaperfur images, and quadrapeds are pretty uncommon but I do see them on rare occasion. I suspect they're hard to draw diapered. (MLP is a lot more common though, I suppose that's no surprise, that specific one is common enough to not really help your hunt for a different animal)
search the galleries on these artists, they both do transformation and diaper art. they're mostly biped but that may be your best starting point:
CAT-MONK SHIRO. Apologetically Canadian. :P. CanadianFurs. . Commissions available in stream on Picarto(url), Mon/Tues/Thurs/Fri.. STREA ...
www.furaffinity.net
. . . ⭐️ Welcome to my FurAffinity page! ⭐️. . . ❤️️ Confuzzled Guest of Honor 2019❤️️. ⭐️ Ursa Major Award winner for Best Graphic nove ...
www.furaffinity.net
Just searching furaffinity for "deer diaper" does give some hits also.