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post #1 of 4 (permalink) Old 04-12-2012, 09:28 AM Thread Starter
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Wearing boots in hot weather

We live in NY (Long Island) and we are planning a trip to Arizonia at the end of the month. We plan to stay for the month of May (see grandkids). My question is whether we need to be concerned about the hot pavement for our 10 month Mattingly in Az. We were there last year, no dog, and we did see many small breeds walking around. We will certainly avoid the hottest part of the day for any walks but in any case should we get boots for Mattingly?

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post #2 of 4 (permalink) Old 04-12-2012, 10:08 AM
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We live in NY (Long Island) and we are planning a trip to Arizonia at the end of the month. We plan to stay for the month of May (see grandkids). My question is whether we need to be concerned about the hot pavement for our 10 month Mattingly in Az. We were there last year, no dog, and we did see many small breeds walking around. We will certainly avoid the hottest part of the day for any walks but in any case should we get boots for Mattingly?

Thanks
Hi,

There was an interesting artice in Science News for Kids about dog paws and how they sense temperature. It talks about both frost bite and hot pavement.

Here's it is - (sorry for the long post)

When playful pups skid across an icy pond or romp in a snowdrift, their paws plunge into frosty places. If people go barehanded and barefooted in such cold places, their skin may freeze in a painful condition called frostbite. Dogs frolic without fear of frostbite, and scientists from Japan say they’ve figured out why.

Dog paws don’t freeze because the arrangement of blood vessels beneath the animals’ skin keeps the temperature just right, the scientists report. The arrangement helps the animal hold on to body heat, which might otherwise be easily lost through their hairless paws.

Hiroyoshi Ninomiya, an expert in animal anatomy from Yamazaki Gakuen University in Tokyo, led the new study on dog paws. During summer, hot asphalt in Japan can reach a scorching 66º Celsius (150º Fahrenheit), he notes. In the winter, the same pavement may drop to about –9º C (15º F).

“I have always wondered how a dog’s paw stands up to that wide temperature difference,” Ninomiya says.

Mammals like arctic foxes and wolves regularly trod on ice, and other scientists had shown that the animals’ pads stay warm thanks to a boost in blood flow. Ninomiya wanted to find out if the same process helped dog paws keep warm.

He and his colleagues took pictures of blood vessels in beagles’ paws using a tool called a scanning electron microscope, or SEM. This instrument fires a stream of electrons — small particles that are some of the building blocks of atoms — at a target. Then the device measures how the electrons are absorbed, changed or reflected. An SEM gives scientists a view of parts of the natural world that are too tiny to view with ordinary microscopes.

The scientists studied blood vessels called arteries and veins. Arteries carry warm blood from the heart to the rest of the body; veins bring blood back to the heart. The scientists discovered that veins surround the arteries that deliver warm blood to dog paws. The two kinds of blood vessels are so close together that they exchange heat: The warm arteries heat up the cooler veins.


Scientists in Japan have found that in dog paws, veins (in blue) run right next to arteries (in red). The warm arteries, bringing blood from the heart, heat the cooler veins, which return the heat to the animal’s core. Credit: Hiroyoshi Ninomiya

As a result, the temperature in the paw stays balanced. Warm blood reaches the pad’s surface to keep frostbite away, but without letting the animal lose too much body heat.

Scientists call this kind of system a counter-current heat exchanger. Ninomiya and his colleagues are the first researchers to find it in dogs, although it has been observed in other animals. Animals like penguins, whales and seals use counter-current heat exchangers in their feet, fins and flippers to keep their body heat balanced. Ninomiya says that he and his colleagues were excited to find that dog paws have a heating system like penguins.

Blood vessels in the dog paws open and close with changes in temperature, the scientists also found. This allows more or less blood to flow, depending on where it’s needed.

In his previous work, Ninomiya studied blood vessels in birds, rabbit ears and whale eyes. Up next, he says, is a close look at cats’ paws. Domestic dogs are related to many animals that live in cold places and need to regulate heat. Cats, in contrast, originally evolved in a warm climate.
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post #3 of 4 (permalink) Old 04-12-2012, 10:32 AM Thread Starter
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Thanks for the info, very interesting. This winter in the N.E. has been pretty warm, no snow to speak of, I'll see how he does next winter. How does the process work for hot pavement, do the viens cool the arteries?

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post #4 of 4 (permalink) Old 04-12-2012, 10:37 AM
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Thanks for the info, very interesting. This winter in the N.E. has been pretty warm, no snow to speak of, I'll see how he does next winter. How does the process work for hot pavement, do the viens cool the arteries?

Thanks
Yes, they believe that the dog paw circulation process works to even out both hot and cold temps. Now I wish I had dog paws-I hate hot pavement!
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