I'm not a vet, but I have experienced more than one blockage.... Yes they can still doodle..... yes symptoms can come & go (had one have the problem on and off for 2 months.... finally took her in..... vet found a little piece of rubber in the stomach that every so often blocked the intestines)... They also can sometimes not be seen in xrays..... If you suspect a blockage.... have it checked out.... the longer it goes the worse it gets and the weaker the animal is for the surgery....... M [Posted in FML issue 1360]