Gwnaeth yr adolygiad ystyried yr holl dystiolaeth wyddonol ynghylch y goblygiadau lles i gathod a chŵn sy’n deillio o ddefnyddio coleri trydan. Gwnaeth hefyd ystyried tystiolaeth Cymdeithas Gwneuthurwyr Coleri Trydanol, y trydydd sector ac unigolion eraill a gyflwynodd dystiolaeth. Gwnaed hynny er mwyn cymharu manteision posibl ac effeithiolrwydd coleri trydanol yn erbyn y pryderon am les anifeiliaid. Drwy hynny roedd modd dod i gasgliadau ynghylch a oedd y manteision yn drech na’r costau o safbwynt lles anifeiliaid.
The review considered all recent scientific evidence in relation to the welfare implications for cats and dogs arising from the use of electronic collars and taking into account evidence from the Electronic Collars Manufacturers Association (ECMA), the third sector and other individuals who submitted evidence. This was to set out the potential benefits and efficacy of electronic collars against the animal welfare concerns, in order to reach conclusions about whether their benefits outweighed the animal welfare costs.