re: Training a dog to track wounded deer.....

Where can someone get blood during the summertime? I didn't save any from hunting season, and saving some from thawing meat would take a while. I cooked a pork loin last week that had a ton in the bag? Think that would work?

My Boykin is pretty good and found 6-7 last year but I probably need to run him on a trail a few times during the summer to keep him fresh