Since the Baby that‘s born from your dino is now the baby from the Rhinio and the dino, it may take some attempts until you get the stats from the dino. You could theoretically take a maxed out dino and ‚breed‘ it with a high lvl Rhinio and it would probably take it‘s staats eventually.

I think the dragweight of the dino is also important, the higher the better. (The bigger the dino, the higher it’s dragweight)