you have to keep treats on you, but not give them every time.
mix it up, but not enough to where you lose the dogs attention, just every once in a while, make them do 2 tricks, then 3, 4 etc... before praise then treat is given.
Mom: russian blue 20yrs
Moose: cat 10 yrs
Del: lab/gsd 4yrs
Biz: Bi color GSD, 6 years