A dog can be fixed at any age but it is best to have it done before the dog is four or five at the latest, because it will heal faster and not be as traumatic to the dog.
It depends on if one or both dogs are fixed (spayed/ neutered). If one or both are fixed your dog cannot be pregnant. Also, your dog has probably matured out of the puppy stage and into the adult dog stage. Dogs typically stop being as energetic after they mature into the adult dog stage. Activity and energy levels depend on the breed, age, and personality of the individual dog.
he should get fixed
no. if a dog is fixed they can never become unfixed.
If either dog is fixed, no, they can't have babies.
Processed dog foods are classified into puppy and adult food. You should give the adult dog food then. Also, homemade dog food can be given to adult dogs.
you could be allergic to puppy or an adult dog
Take your dog to the vet to check up on your dog. Dogs usually get fixed as puppies.
A male German shepherd will usually grow to be a large adult dog.
Yes, if the adult dog was not vaccinated against distemper he can be infected by a sick puppy. If the adult dog has current vaccinations he is not at risk.
You don't find blood on your floor from her getting her period, idk. Let her mate with another dog and if she doesn't get pregnant she's fixed :) Or take her to a vet, they should be able to tell.
No, they cannot.
No