Genetic Welfare Problems of Companion Animals

An information resource for prospective pet owners

Fish welfare


The collection of information and development of this site is a `work in progress'. Non-inclusion of a breed or condition at this time does not necessarily mean that the breed has no genetic disorders or that the condition is not a problem.

NB. Conditions are described on a breed-by-breed basis. It should not be assumed that the conditions listed here occur only in the breed in which they are described. They may occur in other breeds (and in cross-breeds) also. We hope to be able to develop the website to give broader coverage in due course.


Click on a breed to go to the list of conditions for which information is available on this site:

Credits for photo above:

Main photo ©

Bubble-eye Lerdsuwa (Own photo (400D + 50/1.4)) [GFDL ( or CC-BY-SA-3.0-2.5-2.0-1.0 (], via Wikimedia Commons

Celestial-eye JasonMarini (Own work) [Public domain], via Wikimedia Commons

Eggfish By Michelle Jo (Own work) [CC0], via Wikimedia Commons

Lionchu By Melanochromis (Self made. Own work by uploader,) [Public domain], via Wikimedia Commons

Lionhead ©

Pom Pom By Helen Moore (Flickr

Ranchu ©

Tosakin By Lawrencekhoo (Own work) [Public domain], via Wikimedia Commons