HomeCat CoatscailcoGenetic Makeup of Calico Cat Fur May Help To Save Human Lives


Genetic Makeup of Calico Cat Fur May Help To Save Human Lives — 66 Comments

  1. I am absolutely blown away by these gorgeous kitties. Thanks everyone who shared your beautiful photos with us.

    They are all PURRRRRRRRRRRrrrfect!

  2. Dot on the left is much braver than Freckles on the right. It took Freckles almost 4 months to trust my latest rescue “the southern belle” Bianca I adopted from Red Fern rescue in Tennessee. They are almost 5 and are still that size when the picture was taken in 2009.

  3. Hello, I am back and you all MAY have answered a question I have wondered about for about 5 years now. I do have a black calico,a brown calico. But the ones I wondered about were my mainly white cats with just spots of calico. They do have orange,brown and black areas on their bodies. From looking at the pictures posted I assume mine would be considered calico also. The only distinction is that both of the white ones have short coats compared my black calico and my brown calico. I assume that no matter the length of the coat makes no difference. Am I correct?

    • That is correct, Amy. The calico coat comes in a wide range of varieties from a coat that is all mixed up with blurred boundaries between the colours to clearly defined blobs of colour, which you see on the Japanese bobtail cat. The famous three colour Japanese bobtail is the one favoured by the Japanese and you can see it here on this page. It is a calico cat. The coat length varies too, as you say, and you can also see dilute colours.

      • Micheal the picture of the Japanese bob tail is exactly what I am talking about. I do have pictures somewhere and I will try to find them. Although they are sisters their marking are quite different. Thank you for finding a picture that shows pretty much what I was talking about.

  4. This is hopeful. I have to say that we have calicos and torties here. Some are mellow and some are dominant. All of them are very intelligent and learn easily. This is a very interesting article. Thanks Jo.

  5. I have had the good luck to be the guardian of a lovely calico girl; who someone dumped in the street a number of years ago. Let me see if I have a digital image of her. She passed away after battling lymphoma bravely. I am now the guardian of a “tortilicously delicious” tortie girl (my ‘pet’term for her).

    I don’t know how well this will show up, but this was Stormy:

  6. Good blog, Jo. As long as they can do research on the kitties that benefits the humans and doesn’t hurt the kitties, I’m all for it.

  7. Going back to the temperamental behaviour of calico cats, it describes my Tiggy who passed away last year exactly. She was feisty,stubborn and wilful.but also very loving and caring and I miss her a lot what a character she was. could be coincidence but who knows. Felt I had to comment on this and I read all the input very interesting.

    calico cat

  8. I think it needs to be made clear that calico usually means red and black with white, or tortoise-shell and white. The origin of the word is Calicut a city in India where a white cloth with a coloured pattern was woven, but also can refer to a plain white cloth. A pure tortoise shell without white is quite rare but my female Mongolia is one of them. Diluted forms also appear such as blue and cream with white such as my Turkanna. The “calico” colouring can even be expressed in a Van pattern as with Turkanna.

  9. A very interesting article but like Michael I don’t understand genetics of the cat’s fur so I can’t really make a sensible comment.
    But I do hate it when people stereotype cats, or people come to that, torties(calicos) don’t have any more catitude than other coloured cats, redheaded people aren’t all hot tempered, all blondes aren’t dumb.
    But I suppose if it’s helpful research and doesn’t harm the cats in any way it’s OK.

      • And exactly mine as well. You can’t read my mind, and you certainly can’t make sense of my rhetoric nor soused sarcasm when it doesn’t make any sense. (Always, the vodka. Hopefully, I won’t make the mistake of reaching for it the next time that I just need to talk to a friend.)

  10. I think that we truly need to approach this patchy subject matter in a different way; something more akin to a “true” CFA breed…


    • were you being sarcastic, Jo? I won’t even ask if you were being facetious. Obviously, there is no ego involved here. Thank goodness, no cats were harmed in the writing of this article.

      • I don’t care who you rescue, himmie, norwegian, hairless, nor siamese. Just write an article that is well-researched, if anything. Something worthwhile, to the species. please. regardless of pedigree. 😉 Or is that what PoC is about? Focusing on the breed? or focusing on education?

        • The website focuses on all aspects of the cat while focusing on cat welfare and respect for the cat. The site provides information, as you know, about wild cat species, domestic cats, stray cats and feral cats. I don’t have to explain that to you 😉

  11. Jo, WHY didn’t you start with your premise in the first paragraph, instead of what you chose? If you would like me to help you, I can. [Don’t ask Michael to pick it up for you.]


  12. It is nice to see that the humble domestic cat can help people in unforeseen ways. I’ll presume that any research that concerns the calico cat in this instance, in no way harms the cat.

    The genetics of the cat coat is highly complicated. I have read about it quite a lot and never quite understood it although I have a reasonable grasp of it. One difficulty is that even the experts do not know everything there is to know about the genetics of the cat coat types. It is work in progress. An expert on cat genetics by the way is Sarah Hartwell. She loves genetics and understands the subject instinctively. I’m the opposite. I find it baffling! It’s like trying to figure out what happens on a computer hard drive. You can’t see it, you can only imagine it.

    As for “calico cat behaviour”, I’ve always thought that this is Internet hype. There was and probably still is quite a lot of chatter about the character of the calico cat but it means that the colour and pattern of a cat’s for is linked to his or her character and I find that hard to believe.

    That said, people say that redheaded people have a certain character. Clearly people like to link hair colour with character. I think the way people linked redheaded people with a fiery character has spilled over to the calico cat and they have made a similar deduction, which I’m sure is incorrect.

    • Jo said: That said, people say that redheaded people have a certain character. Clearly people like to link hair colour with character.

      Wow. who wrote your dissertation?

        • lol. Please refresh my memory…Who “discovered” and “colonized” the New World? You? and the Spaniards? Well, guess what. My people were here long before that. And long before you claimed “your” Charles Dickens, long before John Muir, followed Michael Pollan. so please, don’t pretend that you do not have problems in your nation, that need to be dealt with where animal abuse and welfare is concerned.

          Not to say that I have never expected anything less than your help. Just stop criticizing and start doing something constructive about it on this website. Michael, you were saying something, and I think that it needs to be reiterated. You are willing to come over here to the U.S. and shoot footage? of whom? I will do all that I can, as I’m sure all of your fellow stateside PoC’ers are willing and ready, at your service… 🙂

          • The only people I criticise and who deserve it are the veterinarians to declaw cats and I want to interview them and find out what goes on inside their craniums! I try to avoid being judgemental. But it is impossible to avoid being judgemental in respect of veterinarians who declaw cats.

            • I am very sorry for that silly tirade, Michael. Actually, it would be such a relief to me if you contact Dr. Rebecca Arnold, “Dr. Becky” as most of us know her here. All-Feline Hospital, here in Lincoln, NE, is her practice. I would so love to do anything I can to facilitate this. just let me know, okay?

              • I have been so conflicted, as you know, about continuing with our Veterinarian-Client relationship, e’en though it has lasted some 20+ years. If there is anything I can do to help facilitate this, please let me know?

                • In my where you came to the States to conduct interviews with the seemingly most caring vets who still perform a de-claw “or two” once a month or so. It must have been my brain, overloaded with stress, and delusional images set in. 😉

          • Michael is right, we can’t possibly avoid being judgemental of vets who declaw cats, they know it’s cruel, but day after day they smugly amputate healthy toe ends just because it’s legal there to do so.
            It’s the worst form of animal abuse ever because it’s done by people who are supposed to help animals, not maim them.
            We have never pretended we don’t have animal abuse here in the UK but the difference is that our abusers are ignorant cruel people but they are not butchers masquerading as vets.

            • I know this, Ruth. I understand, I feel very strongly about zero tolerance for declawing. A true ailurophile certainly would have expected the U.S. to have ended this decades ago. I see animal cruelty everywhere, we all do, but you are right. This is something that should have been on the books long ago. No excuse for it. I feel as you, and hopefully all of us here on PoC, you know that I do. No excuses for our vet.

            • Ruth, you know that I agree with the brutality and cruelty. When my veterinarian of many years, who has done so much to help the feral colonies and strays in our little town, what am I supposed to do? Tell my cats, sorry, you no longer have a doctor/surgeon. I have to take them somewhere, and she is the only DVM I’ve ever fully trusted w/my felines. I have to approach cautiously with inundating her my contempt for her abominable practice of even doing ONE declaw per month. Does that make sense? Tell me how best to approach it–if you were me, what would you be doing as a human who needs to take the best care of her cat that she possibly can, but has no place to go within 290 km? I think that you know how much I want to keep repeating in as many ways that I can how unethical she is to be still performing declaws in her practice. I DO NOT care if she is down to four per month “on average.” It doesn’t make any sense to me to email me to say this!

              • Let me rephrase that, if Michael does not do it for me: I can hardly stand to image the brutality and cruelty to those trusting kittens and cats. You amaze me, Ruth. Your perseverance, your strength that never fades. I truly admire you, and you know that we all do here. Tell me again, what would do, if you were in my shoes? I need to hear it.

                • Caroline stop torturing yourself over this vet, it’s making you ill! You have no choice but to use her for your cats, in your position I’d do the same because we have to put our own cats health and welfare first.
                  You’ve tried to make her see that all the good she does for some cats is wiped out by the fact that she cripples other cats, even 4 cats a month is 48 a year and she’s dooming those cats to live a disabled life,she ignores the fact that each and every cat deserves to keep their claws.
                  If I was you I’d say no more about declawing to her, keep on educating as much as you can, tell everyone you meet the truth about how cruel declawing is, they will tell people they meet, as word spreads YOU will be saving countless cats claws.
                  One day it will be banned and your vet will HAVE to stop, so like Michael says …don’t beat yourself up about it, you’ve done your best with her.
                  You are grieving for your dear little Lucky so be kind to yourself, take care of yourself, we need YOU to help us fight declawing xx

              • Caroline, if you have to use a veterinarian who is engaged in cat declawing because there are no other choices in your area then that is the way it is and nobody can blame you for using this vet. Don’t beat yourself up about it.

              • I had the same situation, Caroline- actually.

                The feline-only practitioner that cared for Mousie Tongue (my sealpoint Siamsese with megacolon) declawed and stood firm in her convictions, even though I tried very hard to knock some sense into her head. She claimed that declawing preserved homes. I tried to dispell this myth until I was blue in the face- to no avail. Talked about declawed cats being surrendered to shelters due to “bad” behavior- etc. She wouldn’t buy it.

                But she was the BEST feline practitioner in probably the entire state of Florida. She cured Dr. Hush Puppy’s impacted, infected anal glands- other vets would have removed them- but she preserved them. She had magical hands and was brilliant. So what was I to do but to continue taking my kitties to her. No one else could do what she did for them.

                She was very set in her ways, and I am sorry that her practice continues to declaw. I have a vet now that won’t declaw. She educates any person requesting the surgery and they change their minds. Her staff also educates folks inquiring about it. I gave her one of Jennifer Conrad’s DVDs for a Christmas present, and she has been showing it and discussing it in staff meetings. I am thrilled!

                No need to beat yourself up about it. Sometime we need to use vets who declaw. She saved Sir Hubble’s eye- she was the only one that even attempted to to this. So what can I say?

                Wish that all vets would stop- one day perhaps they will GET it- and understand how cruel and unneccessary it is. That’s why our work here and in the real world is so crucial.

            • Ruth, I am backtracking here through the comments. Shrimpster’s overnight, which I never expected–I waited at my hospital until they finally came up to me and said, like they so often do, “He has to spend the night. We’ve had too many emergencies in the last few hours.” That was not supposed to have been. I did not even get to say, “Hey Shrimp, I’ll see you first thing in the morning, xxx.”
              I just want to say that I do not believe for a second that Dr. Becky would “smugly” amputate. I do not know why her conscience does not take control and say, “Enough is enough!”
              I’m hoping that this morning, when I show up and wait, and I finally get to talk to her face to face, just like twenty some years ago when her practice was in the back office of a pathetic pet store at East Park Plaza, I can ask her, “why are you feeding the egos of those stupid humans who will not face their own demons? Because you won’t face yours?” I hope that I remember to ask her this, when I pick up my Shrimp to bring him back home. I do have a sealed envelope containing a note, asking if I could interview her in the near future on her reasons for performing de-claws, even if it be “only” four per month. She does so, so much good! How could she still justify this?

    • Well, could you please make a distinction between the terms “pedigree” and not so ‘purrfect’ degree? 😉 Here is my pic:

      X-Linked Genetics in the Calico Cat

      Calico is a coat color found in cats, which is caused by a SEX-LINKED, CODOMINANT allele.

      B = Black
      R = oRange
      BR = calico

      The following genotypes are possible;

      Female cats can be black XBXB, orange XRXR, or calico XBXR
      Male cats can be black XBY or orange XRY

      Show each of the crosses below and include the phenotypic ratios of the offspring.

      1. A black male crossed with an orange female

      2. An orange male crossed with a calico female

      3. A black male crossed with a black female

      4. An orange male crossed with an orange female

      5. A black male crossed with a calico female

      **If you are a cat breeder, what type of parents should you choose to have the MOST number of calico kittens?

      Sarah Hartwell probably has more experience in all of this, than any of us put together. Thanks, Michael.

      • Michael, is any of us “purr”fect? I am so tired of seeing the cat cat’s purr maligned on PoC, using it as an egotistical “nomenclature.”

          • I am willing and ready to do whatever I can to help in this endeavor. I just need your guidance. As well as Ruth’s. Let me know how I can best proceed, especially where my long-term veterinarian is concerned, because at this point I no longer know what is most constructive. I want to help as much as I can, to change our veterinarians delusional pattern of thinking. TIA, Cal

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