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Because dogs have more hair than humans, so they get hotter and breathe faster.
Additional information:
It's unclear whether you're asking about dogs panting or simply breathing faster in general.
Cooling
Unlike humans, dogs have very few sweat glands (most are in their paw pads), so they cool themselves primarily by panting. This allows air to travel across the moist lung tissue, which helps the dog cool down.
Breathing, in General
Smaller animals have faster respiratory and heart rates so their bodies can take in enough oxygen. Blood travels through their circulatory system much faster than it does through a larger creature's system, so they have to breathe more often.
What else can I help you with?
Why do dogs bark and not talk like humans?
since humans talk when they breathe out and dogs do it when they breathe in this is the main reason why humans talk and they bark
Do humans breathe faster in cold water?
ANSWER: yes
Do dogs breathe out the same gasses as humans do?
All animals breathe out the same gases. It's a fact of Respiration.
Is a dogs pulse greater or less than a humans?
A dogs pulse is greater than a humans. The smaller the animal the faster the heartbeat. For example if you compare a cat to a mouse, the mouse has the faster heartbeat because of its size.
What do plants do when you and other humans breathe out?
when you breathe out, plants breathe in.
Why do we breathe faster when exercising?
breathe like a dog
Do dogs breathe in when they bark?
yes they breathe frequently
Why do dogs have different years?
It's just a convenient way of saying that dogs age faster than humans.
Do you breathe in or breathe out oxygen?
Humans breathe in oxygen and breathe out carbon dioxide. Trees "breathe" out oxygen.
When you breathe faster why does your heart beat faster?
yes, it does!
What does a cow breathe?
The same air that we humans breathe in.
Do kittens breathe faster than cats?
Yes, kittens typically breathe faster than adult cats.
