If your on Ark mobile, the place that I’ve found all 3 of my tamed Equus is on a beach slightly to the right from Herb Island (sorry if it doesn’t make sense). Another way to get to it is running west from the swamp along the beach when you reach the end of that beach run north for like half a minute and that’s the beach im talking about.

Just be careful because I’ve seen Rexes, Carnos, Allos, Theris, Sarcos, Terror Birds and soooo many Raptors spawn there, it’s better if your on a flyer so you can get up to higher places to escape.

Also if you are struggling with non-mount taming just go for the mounted taming, it takes a tad bit longer but that’s the only difference, it can also stop it from walking into carnivores. I recommend a good stack or two of carrots but if you don’t have crops yet mejoberrys work fine they just take longer.