ler ▁as ▁B ren nan ▁Newton , ▁and ▁Mich a ela ▁Gal lo ▁as ▁S ara ▁Newton . ▁ ▁Plot ▁▁ ▁Richard ▁Newton ▁checks ▁in ▁with ▁his ▁two ▁children , ▁S ara ▁and ▁B ren nan , ▁before ▁school . ▁The ▁children ▁love ▁their ▁St . ▁Bernard ▁dog , ▁Be eth oven , ▁who ▁they ▁are ▁keeping ▁for ▁a ▁relative ▁family , ▁but ▁their ▁parents ▁do ▁not , ▁and ▁want ▁to ▁get ▁rid ▁of ▁him . ▁So ▁the ▁children ▁begin ▁taking ▁the ▁dog ▁to ▁O bed ience ▁Training ▁led ▁by ▁a ▁former ▁army ▁ser ge ant . ▁B ren nan ▁falls ▁in ▁love ▁with ▁a ▁girl ▁named ▁Hay ley , ▁while ▁Be eth oven ▁literally ▁dest ro ys ▁the ▁obst acle ▁course ▁in ▁one ▁day . ▁To ▁top ▁it ▁all ▁off , ▁Be eth oven ▁hits ▁the ▁army ▁ser ge ant ▁in ▁the ▁gro in ▁with ▁a ▁le ash ▁causing ▁him ▁to ▁kne el ▁over ▁in ▁pain . ▁ ▁Meanwhile , ▁the ▁rich ▁S edge wick ▁family ▁own s ▁a ▁pam per ed ▁and ▁well - be hav ed ▁St . ▁Bernard ▁that ▁looks ▁exactly ▁like ▁Be eth oven , ▁named ▁Michel ang elo . ▁Michel ang elo ▁and ▁young ▁Mad ison ▁S edge wick ▁are ▁friends , ▁but ▁her ▁busy ▁parents , ▁Regin ald ▁and ▁Mar tha , ▁are ▁always ▁neglect ing ▁her . ▁In ▁fact , ▁Regin ald ▁is ▁the ▁only ▁one ▁who ▁seems ▁to ▁try ▁to ▁play ▁with ▁her . ▁Be eth oven , ▁mean while , ▁runs ▁after ▁a