I would not mix him with other dogs, you can't tell where the other dogs have been or if they have had their shots. Dogs will sniff or lick feces etc. Get the shots.
Yes, just like humans, dogs will feel injections.
Cause some dogs like other dogs. Even if it was wet or not probably the dog would still greet the other dog.
it could mean that your dog has been fed something or has eaten something that hasnt agreed with its stomach or he might be sick or have an allergy to something.
Dogs Like/sniff other dog butts to get information about the dog. It is a form of communitcating.
the dog is most likely insecure and afraid of the attention of other dogs try dog whispering
some dogs can but other dogs can not
To get the dog used to other animals and dogs you have to put it in a room with other people and you have to have people and dogs around for a period of time and then they will finally get used to people and other dogs.
there might be something wrong with your other dog. Dogs can sense things we cannot.
Well... dogs kinda help every other dog so there's not a specific dog that helps dogs.
Your vet can give the dog an injection which will painlessly end it's life.
it depends on the dog
NO other dogs should be around the pregnet dog :o)