When they lay down. They are moaning. When they dont eat their food. When there moody. and... they may throw up, there nose gets dry, they can get a fever and they won't eat but if they do they won't eat as much as they usually do.
yes dogs can get sea sick but only a few dogs do
Depends on why they're sick. They can carry and spread viruses and such.
Yes, dogs can get sick at any age, even if they are young and old.
Yes, mini dogs can easily get sick if they are introduced to a brand new environment.
Yes, since humans can get sick from drinking it, then dogs can too.
Well humans don't really get sick from dogs unless the human/owner has the dog slobber in his or her mouth but some people have allergic reactions to the dog but yes people can get sick from dogs. :)
how
who couldnt
it might be sick or in pain
NO!
Yes
Dogs should not eat grass it makes them sick a lttle of it is fine it will help them but to much will make them sick