Dogs go in heat when they're ready to breed -- they don't have recreational sex -- and it's usually about a 3 week cycle. Some will breed with most anything, others are a bit more particular (and that shouldn't in any fashion be construed or paralleled with women generally).
If you're not dealing w/ a show dog or a purebred bloodline that you intend to "title out" and breed, have her spayed and everyone will be much happier.
Check the phone book and ask at least a couple of Vets and for their recommendations for low expense spaying.
They're driven by hormones w/o the benefit of rational thinking interfering.
If the dog is not spayed then it is most likely certain the dog is in heat. This is stage one. In just a few days she will start to produce a red discharge, this is stage two. When the dog stops producing the discharge she is in stage three and is ready to mate. It is important not to mate a dog till her second heat!! It is detrimental to her health and her offspring.
A dog urinates the same if she is in heat, heat does not affect her urination
The dog is most likely uncomfortable with its surroundings, hasn't adjusted to its home, or was previously abused.
The dog is uncomfortable around humans still, maybe. Most dogs are like that.
The dog is usually uncomfortable,or angry, due to a stranger or another animal.
Usually when dog gets sick they will find it hard to stand or walk they will feel uncomfortable.
if it looks uncomfortable, consult a vet to be safe.
Corpus Christi
The tongue and the pads of the feet are where heat is cooled on a dog.
Yes, when you spay your dog, she can no longer go into heat.
No, a dog must be in heat to mate successfully. Otherwise she will not get pregnant.
I suggest that your dog has been spayed. If your dog has been spayed she will not go into heat.