Whenadogfollowsitsnose,it'sactuallybeingledbytheekeysenses.Sight:aglimpseoftheenemysavesthembarkingupthewrongtree.Sound:abarkcanbeafiercethreat,butit'salsohowcaninesmaketheirlongdistancecalls.Smell:thistellsadogmorethanalltheothersensesputtogether.
Insideitsnosearearoundtwohundredmillionsmellsensitivecells,fortytimesmorethaninhumans.Throughthemthedog'sbraincanpickupsignalsfromonemoleculeofscentinamillion.Itgivesthedog:acompletelydifferentpictureoftheworld,basedonwhatitsmells,ratherthanwhatitsees.
Flowersareirrelevanttoadog.Sotheirscentismeaningless.Butfoodisaseriousmatter.Whattousisanemptyplate,iscoveredwiththesmellofchickentoahungrydog.【篇二】
Ioftenplaywithhim.Ioftentakehimoutsideforawalkontheweekends.HealwayswaitingformeinfrontofthehousewhenIgobackhome.WhenIamsad,hefeelssad,too.Heisanxioustopleaseme.
Mydogissoaffectionate.Ilovemydogverymuch.Doyoulikeit【篇三】
Dogscandoalotofworkforman.Theyplaywithus.Theyhuntwithus.Theykeepdoorforus.Butlongago,dogsallovertheworldwerewild.
DogscandatebacktotheStoneAge.Alldogshavethesameancestor.Itisbelievedthattheirancestorwasmuchlikeawolf.Otheranimals,suchasthefox,camefromthisancestor,too.Hundredsofthousandsofyearsago,manbegantotamewilddogs.Afterthedogsweretamed,theyweretrained.Thestrongdogsbecameworkinganimals.Theyweretrainedtopullheavyloads.Theylearnedtokeepaneyeonthesheepandotheranimals.Workingdogshadotherjobs,too.
Somedogswerenotstrong.Buttheycouldhelpmanhuntforgame.Otherdogswerebestaspets.