dermoid sinus is the canine equivalent of spina bifida. it's a congenital defect.
do you want links?
we can start with Wiki
Health conditions known to affect this breed are hip dysplasia and dermoid sinus which is the canine version of the human condition, spina bifida.
what is spina bifida?
Spina bifida is a birth defect that involves the incomplete development of the spinal cord or its coverings. The term spina bifida comes from Latin and literally means "split" or "open" spine.
What is dermoid sinus?
Dermoid sinus is a tubular indentation of the skin in the middle of the back, that may go as deep as the spinal canal. The tracts may be single or multiple.
This condition occurs because of an abnormality early in embryonic development, in which there is incomplete separation of the tissues that will become the skin and the nervous system.
sound familiar?
again, from the Wiki:
The only disqualification in the AKC standard for this breed is "ridgelessness". This term refers to the purebred offspring of heterozygous parental animals which do not inherit a copy of the ridge mutation from either parent and are, in effect, normal dogs which do not have a ridged back.
huh. imagine that. the only thing that disqualifies them from AKC standards is the LACK of a mutation. wow.
FYI, i'm not knocking you or your dog.
I am not saying that Rhodesians arent sometimes born with Dermoid sinus. I am not even saying that it isnt even more common in dogs with ridges or even that the ridge is the cause of the dermoid sinus(thou I dont believe this)
The video stated that only dogs with ridges suffer from dermoid sinus. My link shows that to be false. There are ridgeless and mix breed dogs on that site with dermoid sinus. It is also found in other breeds without ridges. You stated that the ridge was a result of spina bifida. Even if spina bifida and dermoid sinus are related,(even though the veterinary dictionary doesnt mention it) you still didnt show that it is the cause of the ridge. Actually both your link to wiki and your link on dermoid sinus back me up. Dr Bill your quote doesnt either nor does it explain the occurance of the defect in other dogs. Saying a runny nose is linked to a cold and saying that runny noses are the cause of a cold are two very different things. Yes I think both you and your quote are making assumptions.
Now dont get me wrong, I certainly think that modern dog breeding has done some horrible things to dog breeds. I also think that there are ethical breeders out there and breeds capable of some truly amazing things. I still think that the video is inaccurate and has an agenda that they wanted to prove regardless of what is actually true. I also think that eugenics is more heavily influenced by the thousands of years of animal domestication then the other way around. I think it was people trying to apply what we have been doing with animals to people not the other way around, but thats just my opinion.
Really I dont have a problem with either one of you and I am sure that we all probably agree in principle on this matter. If you can actually show me that the ridge is caused by dermoid sinus I would be happy to retract my previous statements.
Also despite what your wiki says there are other features which generally disqualify RR from being show dogs. I dont know what the AKC standard is cause I could give a F**k. I am not really into show anything. Some features are to much white, a less than perfect ridge(my dog), a kinked tail and generally dermoid sinus along with many other non breed specific things. Most of these animals are fixed, which generally is also a disqualifing factor. I ll take a well bred dog with a cosmetic defect anyday. I also have seen dogs that had a dermoid sinus removed and they really seemed no worse off then any of the other puppies. They were all sold before they were born and the condition wouldnt have kept me from buy that dog. I dont intend to breed my dog. They were removed by the breeder. The effects of spina bifida and and dermoid sinus are very different.
My wife is telling me I have to go. Thank you both for being so civil.
Matt
JUst one more thing if dermoid sinus is the equivalent of spina bifida in dogs, why do dogs have spina bifida too.
http://www.upei.ca/~cidd/Diseases/nervous system disorders/spina bifida.htm