Someone said it takes more arrows to KO one than the app said. I just found a lvl 13 Allo, app said 11 tranq arrow w/ crossbow to body, and I put all 11 arrows into its body ( mainly because it was squirming all over the place in the enclosure) but 11 did the trick after letting it set and build up over time. App is accurate if you ask me

More Allosaurus Taming & KO Tips