I'm sad to say I was unfamiliar with cartoonist James Chapman's Soundimals before he tweeted this helpful primer to sounding like a dog in 14 languages. I plan to remedy that.
Available on his Etsy page, Soundimals: An Illustrated Guide to Animal Sounds in Other Languages is just what the title suggests: 32 pages of Chapman's too-cute animals demonstrating what sounds they make around the world. In Romanian, the bear says "MOR," and in Japanese, the elephant says "PAO," and so on. You can see a selection of the pages on Chapman's blog.