How to tell if a male dog is in heat?

can a female dog in heat make another female dog go into heat?

Can a dog get pregant when she first comes in heat and how can I tell if she is

My 2 yr old Shi Tzu may be pregnant....but my 3 yr old male shi tzu acts as if she is in heat? Is there some kind of hormone...

How long does a female & a male dog stay tied up when they get together?

My dog had puppies on 3 Dec 2009. How long before she will go into heat again?

Ok well I heard some kids at school talking about this. They said you could use a male dog to make a female dog go into heat....

We have a male dog and a female dog and my female dog is in heat and they have gotten stuck quite a few times already. My mal...

Sometimes when my dog has other dgs over, they try to tye with her. Sometimes she lets them stay. But then she growls and the...

Is my dog preg after being stuck for 20 mins its been about a week ...

Do male dogs reproduce their whole life, or do they go through menopause too?