Maremma sheepdogs do not fetch!
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See http://www.maremmano.com for full information on the maremma sheepdog as a livestock protector.
In this video, this young dog is in a backyard and not with livestock, you can see the typical behaviour of the maremma sheepdog when you try to engage in fetch play as this play is based on predator motor patterns which are absent in the maremma