L.A.N. tamed Dogs despawn 1.4.7.

Okay, so im playing a LAN world and i have tammed some wolves and put them in a kennel, this kennel is inacessable from the outside except for a iron door with a button and is well light,my wolves seem to despawn whever i go out of my chunk or on a travel and come back they are gone sad becuase i love wolfs!