Pets on leads dissapear

So basically my friends got my fox named Ben and ran off with it then i took Ben back and tied him to the pole with the lead i then turned off my console (i did that yesterday) the I come back and the lead that is tied up is still there and Ben is no where to be found. I think it was a glitch and I played my game on Xbox One S Beta 1.16.100.52 also I know it sounds silly but I miss him and could you try and fix it and bring Ben back