Great Service

December 12, 2008

I just had a great service experience from Erin Campbell at Hound Togs. It’s getting cold here and I needed a coat for Tawzalt. She is still only 7 months, so I wanted to get a coat that is sized just big enough that she can grow into it but without being enormous.

I used the tools on the Hound Togs website to describe Tawzalt so that they could size the coat for her. Shortly thereafter I got both a call and email from Erin. She had decided that none of the prêt-à-porter sizes were quite right. She offered to customize a large whippet coat to fit Tawzalt at no additional charge.

This was above and beyond service. It was great dealing with her. The coat arrived today and it fits a  bit loose with some room to grow, just like I asked.

Tawzalt in her coat

Tawzalt playing in her new coat.

Its still cold out here, stupid.

It's still cold out here, stupid.

Savage Azawakh

December 7, 2008

A typically savage moment between an Azawakh and a child.

Cassandra cuddling Azelouan

Cassandra cuddling Azelouan

There have been quite a few hits on my ravings over Azawakh color genetics. Seems a popular topic, so here are some more in-depth resources on dog coat color genetics on-line.

The combination of a vertical format, low body mass and powerful muscles yield tremendous jumping ability in Azawakh. In West Africa I once saw a Fulani dog leap over a 10 foot wall. It took the dog two tries.

Azelouan learning to fly @ 9 months

Azelouan learning to fly @ 9 months

 Azelouan leaped the stream and landed safe and dry on the other side. I was able to position myself to capture this image because he does this all the time.

Theory

In 1887, Joel Asaph Allen posited a biological rule that warm-blooded animals in colder climates tend to have shorter limbs than the equivalent animals from hotter climates. Christian Bergmann, posited a similar rule in 1847. Bergmann’s rule is that the body mass of warm-blooded animals increases in colder climates.

Azelouan 110 degrees Farenheight

Azelouan 110 degrees Fahrenheit

The mechanism behind these phenomena is thought to be temperature regulation. Warm-blooded animals have to maintain a narrow core body temperature range or they die. Surface area to volume ratio is a critical factor in heat transfer. A low surface area to volume ratio tends to retain heat while a high one tends to radiate heat into the environment. This effect is the reason that car radiators and the heat exchanger in an airconditioner have huge surface area.

Surface and Volume

Shape controls the ratio of surface area to volume. A sphere is the shape with the minimum surface area for volume while a flattened pancake has close to the maximum surface area for volume. This is oranges burst when you squeeze them. As the orange flattens, its volume stays constant but the skin must stretch. Eventually you exceed the elasticity of the skin and the orange bursts.

Another example is a stack of 8 sugar cubes (1cm x 1cm x 1 cm). If you stack the cubes 2 x 2 x 2, then the volume is 8 cubic cm and the total surface area is 16 square cm. If you stack the cubes in a 1 x 2 x 4, then the volume is still 8 cubic cm but the total surface area is 22 square cm.

Azawakh Morphology

Azawakh are medium-sized hounds in the range of 40-50 pounds. That makes them the same mass as a Norwegian Elkhound but about 7 inches taller. That’s Allen’s rule in play. An English Greyhound is of roughly similar height to an Azawakh but weighs 20-30% more. This is Bergmann’s rule in play.

To use a car metaphor, the Elkhound has the same size engine but a much smaller cooling system and the Greyhound has the same cooling system but a much larger engine. The flat, dry musculature, long legs and high tuck of the Azawakh are all adaptations for heat tolerance.

My wife discovered xylitol as a exchange student in Finland. She tends to seek out xylitol gum. I’ve just learned that the stuff is extremely poisonous to dogs, like antifreeze or rat poison. It’s much worse than chocolate.

According to the ASPCA Animal Poison Control Center (APCC), dogs ingesting greater than 0.1 g/kg of xylitol should be considered at risk for hypoglycemia. At doses exceeding 0.5 g/kg, there is risk of liver failure and other more serious effects. Eating a couple of pieces of xylitol gum could be enough to kill your dog.

Previously, I wrote about the color rules in the FCI standard for the Azawakh breed. The FCI or Fédération Cynologique Internationale is the governing body for purebred dog standards throughout Europe and most countries. At a high level, the way this works is the main body sets standards and policies in Belgium and then member kennel clubs in each country administer a registry. The big exception is the USA and England which have their own kennel clubs which set their own breed standards. I don’t know this definitively, but I’m guessing that since the Kennel Club (KC) and American Kennel Club (AKC) were founded in the 1890s by a number of uptight pretentious men they had very little interest in taking orders from a wholly separate set of uptight European pretentious men who only got around to organizing themselves in the 20th century.

The point I’m getting at here is that the AKC and KC can have totally different rules and standards for a breed than the FCI. In fact, they don’t even have to recognize the same breeds as the FCI.

Take Azawakh, for example.

The FCI recognizes Azawakh as an official breed with a rigid standard. The AKC recognizes Azawakh as a rare (foundation stock) breed which cannot even be shown in regular dog shows. The status as a foundation stock breed means that things like the registry and conformation standard for the Azawakh are in flux with the AKC and considered fungible. Some things have already been changed relative to the FCI standard: colors, for example.

The standard proposed by the American Azawakh Association for use by the AKC is the same as the FCI standard except where colors are concerned.

FCI Standard

Color: Fawn with flecking limited to the extremities. All shades are admitted from clear sand to dark red. The head may or may not have a black mask and the list is very inconsistent. The coat includes a white bib and a white brush at the tip of the tail. Each of the four limbs must have compulsorily a white “stocking”, at least in the shape of tracing on the foot. Black brindles are allowed.

Eliminating faults:

Absence of any white marking at the extremity of one or more limbs.
Light eyes; ie. bird of prey eyes.

Proposed AKC Standard

Color: Fawn, clear sand to dark fawn, brindle, white, black, grey, blue, grizzle, parti-color, and all shades of brown to include chocolate. The head may or may not have a black mask. There may be white markings on the legs, bib and at the tip of tail.

Eliminating faults:

Absence of any white marking at the extremity of one or more limbs.
Light eyes; ie. bird of prey eyes.

The standard proposed for the AKC is much better that the FCI one. Since it now includes everything but the kitchen sink, is it even meaningful or is it just a complicated tangle of words that nobody can possibly remember? Also, there are combinations of acceptable colors that would guarantee the eliminating fault of “light eyes”, such as homozygous blue dilution with homozygous liver (dd + bb). The light eye prohibition seems to be baseless.

Field studies conducted by ABIS have found that there Kel Tamasheq do not systematically select for particular colors. It seems to me that we should adopt the same lack of criteria. After all, the dogs are much more theirs than ours. 

Color is a distraction that shouldn’t be driving the selection of Azawakh. I propose a straightforward and easy to remembe simplification that would make color a non-issue.

Straightforward Standard

Color: Any color combination is acceptable.

Eliminating faults:

Absence of any white marking at the extremity of one or more limbs.
Light eyes; ie. bird of prey eyes.

 

View as a slideshow.

Hello!

Hello!

Stretch

Stretch.

Good lord, its raining.

Good lord, it's raining.

Good lord, its raining.

High stepping.

Getting a move on

Getting a move on.

Warming up

Warming up.

Chase

Chase.

180

180.

Tag

Tag!

Wet, wet, wet.

Wet, wet, wet.

What is this thing?

What is this thing?

Pooped Pups

November 30, 2008

After several hours in the field chasing live critters and followed up with a day of chasing a plastic lure, these puppies are cooked. Plus the weather is vile today. Hovering around 40 degrees and raining. It’s a good day to snuggle on the couch and snooze.

Azelouan and Tawzalt Snooze on the Couch

Azelouan and Tawzalt Snooze on the Couch

More Azawakh Color Genetics

November 26, 2008

Or Yet More Wrong Rules in the FCI Standard

Last time, I took a spin through coat color genetics in dogs and tool a look at some of the things in the Azawakh standard that don’t fit. I left out some finer points of discussion involving genes that convert black pigments to  brown and/or blue.

Let’s start things off with some quotations from the FCI Azawakh standard and then we’ll take a look at whether they make any sense.

 
Nose: Nostrils are well opened. The nose is either black or brown.
Eyes: Almond shaped, quite large. Their color is dark or amber. Eyelids are pigmented.
Coat: … Black brindles are allowed.
Eliminating Faults: …

  • Light eye: i.e., bird of prey eyes

Although these are color rules in the FCI Azawakh standard are outside of the discussion of the coat, the loci that control these traits also affects coat color.

The Liver Locus, B

  • B – normal black
  • b – black pigmentation converted to brown

The default color for noses in dogs is black. Brown noses are controlled by the the B or Liver locus. The recessive allele of this locus affects the production of eumalanin, converting all black in the coat to brown (aka liver). Saddles, shading, brindling and nose pigmentation are all converted from black to brown. Recessive B (bb) also causes amber eyes. When liver is expressed, anywhere there is black in the body of the dog it is converted to brown. It is impossible for a bb dog to have black anywhere in its coat.

Recall that brindle is controlled by the K or black locus. The dominant black K gene does not occur in Azawakh but the semi-dominant k(br) allele does occur as well as the k, non-black, allele. Any dog that has a k(br) gene will be black brindled, but if it also has recessive bb, then the bridling will be dark brown.

The amendment that added brindling contains a mistake. At the very least, it must be changed to allow black or brown brindling.

The Dilution Locus, D

ABIS has surveyed a few blue Azawakh in the Sahel and there have rarely been blue Azawakh born in the West.  This can be expressed as either blue brindling or blue mask or both. Blue is controlled by the D locus.

  • D – normal pigmentation
  • d – dilute pigmentation

The recessive d allele primarily affects the production of eumalanin pigment, causing it to shift from black to blue. It also has a slight effect on red phaeomelanin pigment causing it to be less red.

The D locus can interact with the B locus. If a dog is both recessive liver (bb)  and recessive blue (bb), then it will have Isablella black. Weimeraner’s are isabella colored.

Blue causes amber eyes.

Blue also affects nose pigmentation. In a blue dog, the nose cannot be black, it will be blue. In an Isabella dog, the nose is isabella which looks like brown with some blue tattooing.

Amber But Not Light Eyes?

I cannot understand what the difference is between amber and light eyes.  Very light eyes occur in isabella dogs which must be both recessive for B and recessive for D, an excruciatingly rare combination in Azawakh. Most likely amber is caused by the expression of recessive B (liver). In a liver dog, there is no genetic difference between a dark amber and a lighter amber. These are just chance differences in development of pigment producing cells. Both are caused by the bb combination, which is allowed. Also, how light is light? When does amber become “bird of prey”? How many angels can dance on the head of a pin?

The light eye eliminating fault prohibition should be stricken.

A Re-Rewrite

Last time, I made a whack at rewriting the coat color rules. I mostly left out the discussion of dilution and brown loci. I need to update my rewrite to account for those loci.


Nose: Nostrils are well opened. The nose is black, brown, blue or isabella (blue + brown).
Eyes: Almond shaped, quite large. Eye color is any shade of brown or amber. Eyelids are pigmented.

Color: The base coat colors are forms of sable ranging from ivory to red and may be grizzled. Brindle markings may be present. Mask may be present. Mantle or saddle may be present. White on the extremities, with or without ticking, may be present including Irish marked and particolor patterns. Black markings may occur in the liver brown form, the dilute blue form or the combination blue + brown (isabella) form.

Eliminating Faults: …

  • Light eye: i.e., bird of prey eyes
  • Absence of any white marking at the extremity of one or more limbs.