Dog food is meant for dogs to eat. It is made specifically for dogs; most humans do not eat pet food. Then why are humans picking up salmonella from pet food? So far, 22 people have gotten salmonella. A few of the brands that are responsible are Diamond Pet Food's "Chicken Soup for the Pet Lover's Soul" and "Country Value". They were part of a recall that took place in May.
Are humans eating this kind of food? The CDC assumes that people are not eating the food, although with the economy the way it is there is always that possibility. But for now it is believed that the humans have salmonella due to handling of the dog food. If you touch tainted dog food, you can get salmonella. If your dog has eaten food containing salmonella, be sure to pick up the dog's poop with a shovel or a device sold specifically for that task. Be sure to wash your hand with soap and water after such an activity. That sounds like simple advice and something all pet owners should do anyway.
Dogs can have diseases that can be passed to humans. Salmonella is one of those diseases. Be sure to keep up with all the pet food recalls so that you do not give any contaminated food to your dog.
If you suspect that your dog has salmonella, take it to the vet right away. Again, be sure to wash your hands with soap and water after playing with or petting that dog.