▁Origin ally ▁used ▁in ▁the ▁late ▁ 1 9 6 0 s ▁to ▁train ▁hunting ▁dogs , ▁early ▁coll ars ▁were ▁very ▁high ▁power ed . ▁Many ▁modern ▁versions ▁are ▁capable ▁of ▁deliver ing ▁very ▁low ▁levels ▁of ▁shock . ▁Sho ck ▁coll ars ▁are ▁now ▁readily ▁available ▁and ▁have ▁been ▁used ▁in ▁a ▁range ▁of ▁applications , ▁including ▁behavior al ▁modification , ▁ob ed ience ▁training , ▁and ▁pet ▁contain ment , ▁as ▁well ▁as ▁military , ▁police ▁and ▁service ▁training . ▁While ▁similar ▁systems ▁are ▁available ▁for ▁other ▁animals , ▁the ▁most ▁common ▁are ▁the ▁coll ars ▁designed ▁for ▁domestic ▁dogs . ▁ ▁Types ▁of ▁devices ▁ ▁Pet ▁contain ment ▁systems ▁The ▁most ▁common ▁use ▁of ▁shock ▁coll ars ▁is ▁pet ▁contain ment ▁systems ▁that ▁are ▁used ▁to ▁keep ▁a ▁dog ▁inside ▁the ▁per imeter ▁of ▁the ▁residence ▁without ▁the ▁construction ▁of ▁a ▁physical ▁bar rier . ▁This ▁use ▁of ▁shock ▁coll ars ▁is ▁increasing ly ▁popular ▁in ▁areas ▁where ▁local ▁laws ▁or ▁home own ers ' ▁associations ▁prohib it ▁the ▁construction ▁of ▁a ▁physical ▁f ence . ▁Av ailable ▁systems ▁include : ▁in - ground ▁installation ▁to ▁preserve ▁the ▁a est het ics ▁of ▁the ▁yard ; ▁above ▁ground ▁installation ▁to ▁rein force ▁an ▁existing ▁bar rier ▁that ▁was ▁not ▁sufficient ▁in ▁containing ▁the ▁dog ; ▁and ▁wireless ▁systems ▁to ▁allow ▁for ▁ind oor ▁use . ▁Most ▁pet ▁contain ment ▁systems ▁work ▁by ▁installing ▁a ▁wire ▁around ▁the ▁per imeter ▁of ▁the ▁yard . ▁The ▁wire ▁car ries ▁no ▁current