Consult the Progress checkpoint | Intermediate, does your dog meet all the criteria for the intermediate level exercises?
Is your dog able to, consistently, complete your intended goal of Advanced level exercises in one session?
Keep in mind that we do not necessarily transfer the intended goals from beginner level to intermediate/advanced level. The variation of height poses a challenge to the cavaletti exercise the dog is used to. As we increase difficulty in one aspect (i.e., vary the height), we decrease the difficulty in other aspects (i.e., the number of sets/reps)
For example, your dog was able to complete 2 sets of 8 reps (a total of 16 reps) in Ex 2.5 (Intermediate level). Your goal for Ex 2.8 may be to complete 2 sets of 5 reps (a total of 10 reps).