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In page Bear dog:

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Amphicyonids began to decline in the late Miocene, and largely disappeared in the Pliocene. The reasons for this are unclear: possibly it was due to competition with other carnivorans, but no direct evidence for this has been found. The most recent known amphicyonid remains are teeth known from the Dhok Pathan horizon, northern Pakistan, dating to the late Pliocene, classically named Arctamphicyon lydekkeri, which may actually be synonymous with a species of Amphicyon.[4]