Spikes and Tufted Berries

There are several bushes scattered around the half-acre lot where our new house stands. I have no idea what these are, but they have some nasty spikes and red-orange berries with tufts of smaller hair-like spikes. I don’t know what it is, but I don’t want one of the dogs to come into contact with anything to do with this bush. There is a close-up of one of the berries in the inset. Does anyone know what this monster bush is? Click on the image to enlarge.

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Update: Reader Crotalus informs us that this is opuntia leptocaulis, commonly called Desert Christmas Cactus. Thanks, Crotalus!

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