Assertion: mastiff's dog | /r/HasProperty | predecessor
Facets:
value: to all molosser breeds
type: OTHER
Source sentences:
text: Some theories speculate that the earliest Tibetan dogs were predecessors to all molosser breeds, although most experts disagree with this.
text: It has been theorized that an early Tibetan dog is the ancestor to all Molossus breeds, although this is disputed by most experts.