Just another thought, I have a pointer/setter mix pup that I'm training for fall turkey. She's fast as lightning, and ranges big. Her nose seems to be fine, but she prefers relying on her eyes to hunt. A trainer suggested I drag a chukar through the brush, keep her on the leash, and try to keep her on the scent trail instead of letting her hunt, and praising her when she manages to finish tracking and finds the dead bird. Make it fun for her, with a reward when she tracks by nose. Might be a little hard finding squirrels to work with though.