Assertion: mastiff's people | /r/HasProperty | familiar with their specific needs
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Source sentences:
text: Mastiffs are not the best choice for first time dog owners being better suited to people who are familiar with such a large breed as well as their specific needs, bearing in mind that they hate being left on their own for any length of time and as such are better suited to households where one person stays at home when everyone else is out or with people who work from home.