Blood in Semen

I have a 5 year old Shiloh Shepherd intact male.  In the last 6 months he has demonstrated unusual behaviour as he seems to walk about and "air hump" for lack of a better term.
He will ejaculate.
The last 2 times this happened he ejaculated bright red blood...This just happened today.  
We are going to the vet tomorrow, but in the meantime I am just wanting to get some insight on this to see if this is something common in intact males at this age, or if it may be a symtom of something more serious.
He seems happy and normal and healthy in every other way.
Marina

[peekawho]

Sounds like a prostate infection.  Let his vet know, as you are obviously going to do.  Antibiotics should help.  He might need to be neutered, though.

[Jaybay]

Oh the poor dog!  He's got to really be hurting.  Please post back and let us know what the vet has to say.  I hope it's an infection that can be easily treated.  :-)