Yes ground beef is good for dogs to eat and dogs can safely eat ground beef both raw and cooked.
Sometimes a Vet will recommend putting the dog on a raw meat diet which can include raw chicken as well as ground beef.
I used to feed my dog raw some ground beef along with raw chicken in between feeding him his regular dog food and it helped keep him healthy and he lived a normal lifespan.
The raw chicken though should be boiled for about a minute just to kill off any potential bacteria that could be on the raw chicken but other than that it's safe to feed the dog raw chicken or raw or cooked ground beef.