As my dog is just about 10,5 months old, reinforcers may change on a daily basis 🤪 However, this list seems to make sense for now:
Food
Tugging
Sniffing
Stones and sticks she finds (self-rewarding)
Her friend Cobus (Aus. Sheperd she knows from 8wks old)
When she expects Cobus to be anywhere near she gets really excited. I then try to ask her for a bit of obedience and impulse control - eg wait at the gate.
She gets rewarded by being allowed to run to him (Premack Principle)