Chondrodysplasia is a genetic issue, not contagious, and not a disease.  It is a kind of dwarfism present in the Dexter breed, just as many breeds have a form of dwarfism.  Not all Dexters carry the gene for this kind of dwarfism, and there is a DNA test now available which makes it easier to know which animals carry it and which don't—although experienced breeders have been able to guesstimate for many years (with varying degrees of success) by looking at an animal.  It is probably this visual method of trying to distinguish which gave rise to the terms "shortleg" and "longleg" Dexters.  The body type of the "shortleg" Dexter is often "beefier" and shorter; chondrodysplasia carriers typically have this body type, but not all Dexters with this body type and short legs are chondrodysplasia carriers.  This is the reason I try to call my cattle which carry this gene "carriers," or even better "chondro-carriers."  Others call them "dwarfs," "shortlegs," or "affected."  The Dexters which do not have the gene at all are called "non-carriers" of chondro (my preference), or "normal," or "longleg," or "homozygous normal" or "unaffected."

The "bulldog" calf, a non-viable fetus/newborn, results from the calf inheriting this chondrodysplasia gene from BOTH parents.  The statistical probability of a calf getting the gene from a mating of two carrier parents should be 25%.  If both parents are carriers, there should also be a 50% chance of getting a "carrier" calf, and a 25% chance of getting a non-carrier or homozygous normal calf.  From a mating of carrier and non-carrier, the statistical probability is supposed to be 50% for a calf of either of those types (no chance for bulldog).  From a mating of two non-carriers, the only result is a non-carrier.

If this is clear enough, the buyer should be able to choose his/her own goals.  Many breeds have made a concerted effort to rid themselves of genetic anomalies.  In the case of Dexters, a minor if not rare breed, breeders and associations must decide whether the gene pool will be more helped or hurt by efforts to do such at this time; and individual breeders may decide whether the chondro gene appears to have any value for survival or temperament or aesthetics or market or any number of things.  Custodians of a rare breed must be especially careful not to burn bridges and to take a long view for the betterment of the breed, and even new breeders will do well to look beyond their pocketbooks to the survival of the breed as a whole.  Good, conscientious breeders are of mixed opinion on this at this time.

What about Horns?
First a word about the terms:  "Horned" and "dehorned" cattle are genetically horned animals; "dehorned" means that the horns have been mechanically/chemically removed.  "Polled" cattle are genetically and naturally hornless.  Scurs are smallish, hornlike projections or horny scabs, and only show up on polled animals.  Recognizing the differences is not always easy, so understanding the terms can be very helpful when you are talking with a potential seller and asking questions.

My individual ideas on the subject of whether or not horns are desirable/tolerable on cattle have changed.  I began with a perspective coming from a beef background.  Horns are a nuisance if you have many animals crowded together in any situation, and dehorning is not fun.  So I wanted polled.  In trying to foster a calf on a "pasture" mother, I discovered the value of horns for tying without the mother "choking down."  I left horns on a bunch of calves to give enough time to be sure that polled were correctly registered and I began to be able to interact with horned animals, which gave me no more trouble than dehorned or polled ones in the forage-based system I use.  So now I am not adamant about liking any of the three conditions more than another.  Some people like horned because they are part of the traditional look of Dexters or because they think they are attractive.  Some dislike polled because they think they are less pure Dexter.  Much of Dexter history is buried so deeply in the past that that particular point may possibly be solved when DNA analysis becomes more sophisticated, but now is only relevant as far as integrity of breeders and breed associations go in appropriately registering animals to the correct parents.  Both ADCA and PDCA recognize polled Dexters as "real" Dexters if they come through established parental lines.  So it is a matter of breeder and buyer preference.

Regarding dehorning, before I began leaving horns on my Dexters, I successfully used the caustic paste dehorner.  It seemed to give the calf little discomfort and the results were perfect.  I followed the directions very carefully.  Some breeders recommend using a heat-based dehorning wand.  The success of both these methods is heavily influenced by the age of the animal.  For adult cows, the ONLY method I would recommend if you absolutely must do it is the Tri-Bander.  A bull's horns are bigger at the base even earlier in his life so I would not want to sell someone one of my horned Dexter bulls to be dehorned.  In my earliest Dexter purchases I took a cow to the vet for dehorning and I never wish to have that done to one of my animals again.  So if you don't want horns, buy polled, ask the breeder to dehorn early for you, or, some would say, choose a different breed.

If you as a breeder ever discover a polled Dexter calf from horned (or dehorned) Dexter parents, PLEASE report it to your chosen association and have calf and both parents DNA-tested.  I am hoping to have such a calf, just as I am hoping to have twins some day!

Are Dexters miniature cattle?
Dexters are not MINIATURIZED cattle bred down from a larger breed, as Dexters have been small from the first records of their existence.  By the definition of "miniature" as any bovine under a frame score of 1, then many Dexters qualify.  Frame score charts often have age and hip height axes.  Three-year-old cows of 42 inches and under and bulls of 44 inches and under at hip measurement meet that qualification for the term "miniature."  For some reason, the word is a "hot button" but the reason is probably because of our pride that the Dexter is not a miniaturized version of an "improved" breed but rather a fairly rare and special and "primitive" breed.  Sometimes overlooked are the minimums mentioned in the guidelines of 36 inches for a cow of three and 38 for a bull of three.  These "desired height ranges" between the lower and upper numbers correspond roughly with frame scores from 0000 to 0 in both sexes.

What about the "standard"?  What about color?
Some breeds and species have a "breed standard" and prohibit registration (or strongly recommend non-registration) of purebred animals which do not fit the standard.  In contrast, the Dexter breed has GUIDELINES.  Before the printed Guidelines in an official Dexter publication of 2004 (when there was one Dexter association in the U.S.) are these words: "The following guidelines for the Dexter bull/cow are meant as a guide to Dexter enthusiasts and breeders, and represent ADCA consensus as to desired characteristics.  These guidelines are not used to determine the registration of animals, which is solely a matter of pedigree."

The framers of the guidelines carefully distinguished the official guidelines from the kind of standard mentioned at the opening of the paragraph.  Breeders of Dexters are trusted to use their common sense, and to work for the well-being of the breed.  In the ethos of yesteryear in America, that was seemingly enough, much of the time, and those who kept Dexters had a pride in the good breeding of their "little cattle."  If an outstanding bull was 45 inches instead of 44 there was no prohibition against using him, but presumably breeders would try to use him on smaller cows to stick to the general consensus of desired characteristics in getting desired-size offspring.  Since the chondrodysplasia test had not been devised yet, this could mean that non-carrier offspring of carrier cows would be rather large in such a case, but the consensus remained and breeders aimed for some consistency.  Today there is no prohibition against using a 45 inch (at 3 years) bull, but arguments continue about height (both regarding maximum and minimum and regarding having separate guidelines for carriers and non-carriers).  I do not, personally, desire a change in the guidelines because they are clearly a desirable but not compulsory set of ideas regarding what breeders will want to aim for.

White on the rear underline was not prohibited nor even reported on registrations in earlier years.  Much less were outstanding specimens turned into meat animals because of a little white.  The white may indicate some of the earlier, perhaps founding, genes in a strain of cattle, so that is of interest.  Breeder integrity in registering pure animals is important in registered stock.  But Dexter origins are shrouded in mystery so the signs to help us decipher the riddle should not merely be removed or covered up. However, the CONSENSUS when the guidelines were formulated was that Dexters were ideally to be of "whole" color with only a few places on the body with white really accepted.  Rarely is color of protective or harming value to today’s cattle in the U.S., so my opinion is that the color issue in the guidelines is of far less importance than the conformation issues which have to do with the animals’ structure, and thus long term health and ability to function well.  I do color tests because they are now required for proper registration, but otherwise would not.  That color is now a market issue merely marks the fads that humans enjoy when something is rarer than something else.  Probably harmless but unimportant.  (This is arguable since colors reflect heat and light differently and some colors may have more value in some areas of the world and Dexters ARE an international breed...but in general in temperate climates, color may be one of the less important qualities... )