THANK GOD! Mason is ok!! Rawhides and Greenies aren't good to give your dogs (I know you didn't mention greenies but, I thought I would) Like one member said already they swell and,,,they are all fat! not good for them..My Parents had a dog that nearly died because a rawhide got too soft, she tried to swallow it and she was choking!
My Dad had to stick his finger down her throat and thankfully he could grab it and pull it out...her tongue was turning blue..She would have choked to death if they weren't home...This happened many years ago...and greenies!! BAD, BAD, BAD! they can get lodged in the intestines...some dogs have died from this...Alot of members, including myself, use the bully sticks...I have 1 aggressive chewer and there is no way she can chew off a chunk...it is made from beef tendon so it gets kind of stringy looking but, they can't chew it apart...my girls teeth look awesome!!
Good Luck and glad Mason is alright!