Are dogs color blind ?
Dipti and Simba
Someone told me a few days ago that dogs are color blind - they can see
black and white ... is this true ? I am finding it very hard to believe.
- Dipti
Sent via Deja.com http://www.deja.com/
Before you buy.
AdamDavidŠŽ
all fur bearing animals were color blind.
Beats me....I know Saide can see my laser pointer with no problem :?)
adam
--
Adam Freeland
Yankee Box Pass
Yankee Box Pass II
Yankee Box Pass III- Coming Sept. 2000
freeland9...@yahoo.com
Please remove your shoes before emailing me :?)
Dipti and Simba <dso...@yahoo.com> wrote in message
news:8pqund$3at$1...@nnrp1.deja.com...
Vera.Bulles
Dipti and Simba heeft geschreven in bericht <8pqund$3at$1...@nnrp1.deja.com>...
>
>
>Someone told me a few days ago that dogs are color blind - they can see
>black and white ... is this true ? I am finding it very hard to believe.
it is true. Dogs can only see black and white.
Vera
Laura Starnes
>>black and white ... is this true ? I am finding it very hard to believe.
Well I asked mocha what color her color is and she told me brown;)
,
write me if you want, I will even risk spam to hear from you :)
WDW Dec 2-16th, 2000
three labs - mocha, kona, java
two cats - trigger, quervo
assorted fish, yet to be named:)
kaz
Vera.Bulles <Vera....@raketnet.nl> wrote in message
news:AHFpxUn...@asd24-aux-005.tis.telfort.net...
>
> Dipti and Simba heeft geschreven in bericht
<8pqund$3at$1...@nnrp1.deja.com>...
> >
> >
> >Someone told me a few days ago that dogs are color blind - they can see
> >black and white ... is this true ? I am finding it very hard to believe.
>
>
Art Kesler
which, because of their shapes, are called "rods" and "cones." Rods are
sensitive enough to respond to a single photon, the basic unit of light, but
together they create only one coarse, gray image, which is just adequate for
seeing in poor light. Fine detail and color come from the cones, but they need
a lot more light and work best in broad daylight. Dog eyes are made up of rods
instead of cones. Hence, dogs see in black and white.
kaz
Art Kesler <kes...@ix.netcom.com> wrote in message
news:39C1AA8F...@ix.netcom.com...
The Carrolls
colorblind.
What AdamDavid's teacher said was a lie...humans are furbearing animals and
we can see quite a few hues.
~Emily
Dipti and Simba <dso...@yahoo.com> wrote in message
news:8pqund$3at$1...@nnrp1.deja.com...
>
>
> Someone told me a few days ago that dogs are color blind - they can see
> black and white ... is this true ? I am finding it very hard to believe.
>
Lee Harrison
in article 39C1AA8F...@ix.netcom.com, Art Kesler at
kes...@ix.netcom.com wrote on 9/14/00 10:52 PM:
sun...@my-deja.com
believe it. Unfortunately, dogs don't see anything but black and white,
so if you think your dog likes his yellow ball better than his blue
ball, he really likes the light gray one better than the dark gray.
It's disappointing because color is very important to me and it's
something Bindi can't share with me. Maybe in heaven...
Hailee
In article <UCpw5.472$Mx1....@monger.newsread.com>,
"The Carrolls" <car...@dundee.net> wrote:
> I think that it's just green that they can't see, so they're kinda
> colorblind.
>
> What AdamDavid's teacher said was a lie...humans are furbearing
animals and
> we can see quite a few hues.
>
> ~Emily
>
> Dipti and Simba <dso...@yahoo.com> wrote in message
> news:8pqund$3at$1...@nnrp1.deja.com...
> >
> >
> > Someone told me a few days ago that dogs are color blind - they can
see
> > black and white ... is this true ? I am finding it very hard to
believe.
> >
kaz
Lee Harrison <lee...@amaonline.com> wrote in message
news:B5E79AD4.63C%lee...@amaonline.com...
> I think dogs can see all the colors but they only chase black & white.
>
> in article 39C1AA8F...@ix.netcom.com, Art Kesler at
> kes...@ix.netcom.com wrote on 9/14/00 10:52 PM:
>
Paul Braisby
them to chase in silent movies <g>
Rose
"kaz" <n.v...@virgin.net> wrote in message
news:USxw5.4891$h21....@news6-win.server.ntlworld.com...
Juli Jer
That is soooo interesting ... thanks for sharing.
--
Juli Jer
jj...@erols.com
.:*~*:._.:*~*:._.:*~*:._.:*~*:._
The dog days of summer ...
.:*~*:._.:*~*:._.:*~*:._.:*~*:._
Lee Harrison
enabling the goggled dog to see colors.
Think they'd care? I wonder.
Lee
in article 8pubht$2f9$1...@nnrp1.deja.com, sun...@my-deja.com at
sun...@my-deja.com wrote on 9/15/00 5:32 PM:
> I have done some reading on the subject because I didn't want to
> believe it. Unfortunately, dogs don't see anything but black and white,
> so if you think your dog likes his yellow ball better than his blue
> ball, he really likes the light gray one better than the dark gray.
> It's disappointing because color is very important to me and it's
> something Bindi can't share with me. Maybe in heaven...
>
> Hailee
>
>
> In article <UCpw5.472$Mx1....@monger.newsread.com>,
> "The Carrolls" <car...@dundee.net> wrote:
>> I think that it's just green that they can't see, so they're kinda
>> colorblind.
>>
>> What AdamDavid's teacher said was a lie...humans are furbearing
> animals and
>> we can see quite a few hues.
>>
>> ~Emily
>>
>> Dipti and Simba <dso...@yahoo.com> wrote in message
>> news:8pqund$3at$1...@nnrp1.deja.com...
>>>
>>>
>>> Someone told me a few days ago that dogs are color blind - they can
> see
>>> black and white ... is this true ? I am finding it very hard to
> believe.
>>>
Fleabitpooh
>enabling the goggled dog to see colors.
>Think they'd care? I wonder.
>
>Lee
I think the goggled dogs would have more fun at the art musem....
Lynda....
Treat me no differently than you would the queen...
Michael Thompson
she will tell me - lol
Paul Braisby wrote in message <8pvej5$50q$1...@neptunium.btinternet.com>...
>.....but it only chases in monochrome perhaps. Now if we could only get
>them to chase in silent movies <g>
>
>Rose
>
>"kaz" <n.v...@virgin.net> wrote in message
>news:USxw5.4891$h21....@news6-win.server.ntlworld.com...
Neil
Vera.Bulles wrote in message ...
>
>Dipti and Simba heeft geschreven in bericht
<8pqund$3at$1...@nnrp1.deja.com>...
>>
>>
>>Someone told me a few days ago that dogs are color blind - they can see
>>black and white ... is this true ? I am finding it very hard to believe.
>
>
>it is true. Dogs can only see black and white.
>
>Vera
Not strictly true! They CAN see colour, but not as we do.
Here's an extract from Desmond Morris' book "Dogwatching" published in 1986.
A VERY interesting and informative work I can thoroughly recommend.
Incidentally, I have seen other(later) research which confirms his findings
regarding colour perception:-
How well can dogs see?
Dogs have good eyesight but it differs from ours in several respects. For
many years it was believed that they had no colour vision and lived in a
totally black and white world. It is now known that this is not the case,
but colour is not particularly important to them. Their ratio of rods to
cones on the retina of the eye favours the rods much more than ours. Rods
are useful for black and white vision in dim light; cones are employed in
colour vision. The 'rod-rich' eyes of dogs are therefore specially adapted
to a daily cycle which favours dawn and dusk as the periods of major
activity. This is called a crepuscular rhythm and is the typical mode for
the majority of mammals. Humans are unusually diurnal, and therefore not
typical mammals as far as vision is concerned.
The small number of cones in the eyes of dogs reveals that, although they
may not revel in technicolour excitements of the human kind, they must be
able to see at least some degree of coloration in their canine landscape. As
the great eye-expert Gordon Walls so eloquently expressed it, 'To any such
seminocturnal, rod-rich animal [as a dog] the richest of spectral lights
could at best appear only as delicate pastel tints of uncertain identity.'
Quite so, but pastel tints are better than none, and it is pleasant to think
that our canine companions can share with us at least some degree of colour
appreciation as we walk together through the countryside.
In dim light, dogs have the advantage over us. They have a light-reflecting
layer called the tapetum lucidum at the back of their eyes, which acts as an
image-intensifying device enabling them to make more use of what little
illumination there may be. As with cats, which possess the same device, it
also makes their eyes shine in the dark.
Another difference between our eyes and theirs is that they are more
sensitive to movement and less so to detail. If something stands still when
at a good distance from them, it becomes almost invisible. This is why so
many prey species 'freeze' and stand motionless when they become alarmed,
before trying to flee. Tests have proved that if a dog's owner remains
motionless at a distance of 300 yards the animal cannot detect him. If, on
the other hand, a shepherd is one mile distant but making bold hand signals,
these can be clearly seen by his sheepdog. This sensitivity to movement is,
of course, of paramount importance during the long chases when wild dogs are
on the hunt. Once the prey is fleeing, the dog's eyes are at their peak of
performance.
An additional aid for the hunting dog is its much wider field of vision. A
narrow-headed breed like a Greyhound has a visual range of 270°. A more
typical dog has a range of 250°. Flat-faced dogs have slightly less. But
they all have more than human beings, whose visual field is only I80°.
Although this means that dogs can detect small movements over a much wider
slice of the landscape, they have to pay for this with a narrower range of
binocular vision, a range that is only half the width of ours. So we are
better at judging distances than they are.
Neil