We tried a Griffon rescued from a local shelter as an adult when my son was a youth.
The idea was to hunt pheasant and quail.
We made a noble attempt. The dog killed chickens in our yard every time she was turned loose and was impossible to cure of that habit.
Every time she flushed a pheasant, she disappeared over the horizon in pursuit of the flying bird. She usually came home a few hours later totally exhausted.
Then one day, soon after pheasant season opened, she did not come home. I think it likely that some hunter caught her in the field and took her home with him.
Our next hunting dog, a golden retriever, was a much better fit to our lifestyle and family status.