▁the ▁United ▁States ) ▁provides ▁the ▁following ▁comment ▁on ▁the ▁use ▁of ▁a vers ive ▁coll ars ▁( cho ke ▁ch ains , ▁pin ch ▁coll ars ▁and ▁shock ▁coll ars ): ▁" Some ▁train ers ▁use ▁a vers ive ▁coll ars ▁to ▁train ▁" diff icult " ▁dogs ▁with ▁correction ▁or ▁pun ishment . ▁These ▁coll ars ▁rely ▁on ▁physical ▁dis com fort ▁or ▁even ▁pain ▁to ▁teach ▁the ▁dog ▁what ▁not ▁to ▁do . ▁They ▁suppress ▁the ▁unw anted ▁behavior ▁but ▁don ' t ▁teach ▁him ▁what ▁the ▁proper ▁one ▁is . ▁At ▁best , ▁they ▁are ▁un ple asant ▁for ▁your ▁dog , ▁and ▁at ▁worst , ▁they ▁may ▁cause ▁your ▁dog ▁to ▁act ▁ag gress ively ▁and ▁even ▁b ite ▁you . ▁Pos itive ▁training ▁methods ▁should ▁always ▁be ▁your ▁first ▁choice ." ▁They ▁go ▁on ▁to ▁comment ▁on ▁shock ▁coll ars ▁specifically : ▁" The ▁least ▁hum ane ▁and ▁most ▁controvers ial ▁use ▁of ▁the ▁shock ▁col lar ▁is ▁as ▁a ▁training ▁device . ▁The ▁tra iner ▁can ▁admin ister ▁a ▁shock ▁to ▁a ▁dog ▁at ▁a ▁distance ▁through ▁a ▁remote ▁control . ▁There ▁is ▁a ▁greater ▁chance ▁for ▁ab use ▁( d elivery ▁of ▁shock s ▁as ▁pun ishment ) ▁or ▁mis use ▁( po or ▁timing ▁of ▁shock s ). ▁Your ▁dog ▁also ▁may ▁associate ▁the ▁pain ful ▁shock ▁with ▁people ▁or ▁other ▁experiences , ▁leading ▁to ▁fear ful ▁or ▁ag gress ive ▁behavior ". ▁ ▁The ▁N CA E ▁( N or weg ian ▁Council