Dogs
 

Can you please tell me if dogs can catch a cold?
Does it mean anything when a dogs nose is wet or dry?
Are dogs colour blind?
How far can a dog see?

Dogs do not really catch colds, not in the same sense that we do. Dogs can get viruses which may seem like a cold but many of them are quite serious and do require medical attention, not like us, spend a few days in bed and all better.

I have always been told that a wet nose on a dog is a sign of health. I have also heard that it isn't true. I personally think that if a dogs nose is wet it is a **sign** of health (doesn't mean for sure healthy).

Dogs are colour blind but colour blind doesn't mean that you only see balck and white. A dogs sight is similar to that of a human that is colour blind, just sees certain colours as something else. (I new a guy that though I was drinking beer when I actually had green koolaide just to give you an idea).

As for the last question I am not entirely sure about that. I think they have keener sight than we do, and I have heard that they have much better night vision than humans (they must cause dogs in the wild often hunt at night).

Dogs can't see that well at night, they rely on their sense of smell. Their sense of smell is something like 100 times stronger than hours.