breeds of cats

pure-breeding is a form of genetic manipulation humans made up just to amuse ourselves. in 19th century victorian england, eugenics was all the rage, and competitive dog breedingbecame a weird, fancy fad. i made a dogwith super loose skin. i made one with a super flat, (bleep)-up face.

oh, now,that is disturbing. i'm your god now. once these dr. frankensteinswere satisfied, they dubbed their littlemonsters "pure breeds" and used kennel clubs to enforcetheir bizarre standards. (thunder crashes) behold my newest creation. the corgi. a corgi is 10 to 12 inches tall with a foxy head,

wide, flat skull, and non-sly expression, so if your dog looks sly, it's a poser freak, and it's out of the club! that's all a corgi really is. an arbitrary definition made up by a weirdo. okay, but when youget a purebred, you get a good,healthy dog, right? nope! when you hear "purebred," you should think "inbred."

inbred?like a hot dog? adorable, but no. kennel clubs prohibit purebred dogs from mating outside their breed, and often, they're mated members of their own family, making the average pug as inbred as an austrian duke. my blood is very pure. (groans, thud) well, maybe inbreedingis not that bad.

we concur--inbreeding is quite natural, isn't it, sister? (both) mm... mm... mm... ugh, definitely not. the sad truth is,purebred dogs suffer from disturbingly high ratesof genetic disease. it's because of a problem called the genetic bottleneck. here to explainis dr. kirk lohmueller, professor of evolution at ucla.

(professor lohmueller) hi, adam. here's the problem with pure breeding. when species breed in the wild, they can exist in large populations and can mate randomly. this ensures a nice, healthy distribution of genetic variation. but when humans started pure breeding dogs, we had them mate over and over again with their relatives

to get a specific look. when we artificially limited the gene pool in that way, we created a genetic bottleneck. as the same small gene pool is spread between more and more dogs, diseases that would normally be rare, become inevitable.