Osteoporosis is a weakening of the bone matrix to the point that the bones can break under normal conditions such as walking, sitting, standing, etc. This can happen in any animal with calcified bones, although it is rare in companion animals as commercial blended diets (such as Purina, Iams-Eukanuba, Hill's, Royal Canin, etc.) are formulated with sufficient calcium to prevent this. In addition, most companion animals do not go through a process like menopause, which is linked to osteoporosis in human females.
Although I haven't done any scientific studies on this topic, I do understand quite a bit of anatomy, and the results of an orchiectomy (*neutering) on bone density. And to answer in the simplest terms, yes. In any species removing the reproductive organs will stop hormone production, which in turn leads to less and less bone density through time, unless you are giving the dog some form of hormone replacement therapy, which I personally have never seen.
Again, I am not a veterinarian, but it seems logical to me in the anatomical sense.
They can as they still have instinct even if they have been neutered.
Not all the dogs and cats that are adopted from a shelter are always neutered.
no
To prevent them from siring more puppies.
Yes, greyhound rescue organizations neuter their dogs before adopting them out. Sometimes the dogs arrive at the rescue intact but they are neutered before leaving.
Yes. Neutered males remain fertile for up to two weeks following the procedure.
You can have a neutered male and female boxer without worrying that they will try to mate. The dogs will not mate if the male is neutered.
Get your dogs Spayed and Neutered
Not unless the neuter was not done correctly.
If they aren't neutered, yes.
They can. That's what a "eunuch" is.
Because they ARE male dogs. Have him neutered to control unwanted behaviors.