Y pryder parhaus yw y gallai’r gwerthiant masnachol o gŵn a cathod bach fod yn gysylltiedig â safonau lles is i’r anifeiliaid o gymharu â phrynu’n uniongyrchol gan y bridiwr.  Er enghraifft, gallai gorfod eu cyflwyno i nifer o amgylcheddau newydd ac anghyfarwydd, a’r ffaith ei fod yn fwy tebygol i gŵn a chathod bach o’r fath orfod gwneud nifer o siwrneau, gyfrannu at fwy o berygl o glefydau, a diffyg cymdeithasu ac ymgyfarwyddo.
The ongoing concern is the commercial third party sales of puppies and kittens may be associated with poorer welfare conditions for the animals compared with direct purchase from the breeder.  For example, the introduction to several new and unfamiliar environments, and the increased likelihood of multiple journeys for such puppies and kittens have the potential to contribute to an increased risk of disease, and lack of socialisation and habituation.