The 9" bully stick occupies the most versatile position in BSD's size range — longer than the 6" format that serves small and medium dogs as a primary chew, shorter than the 12" that is the standard large dog format, and precisely sized for the 30–55 lb dog population where both the 6" and 12" represent compromises in different directions. For a 45 lb medium dog, a 6" bully stick produces 20–28 minute sessions — adequate but not reaching the full 35–45 minute session duration where the behavioral enrichment benefit most completely develops. A 12" stick for the same 45 lb dog produces 45–60 minute sessions — longer than necessary and not economically ideal when the 9" at 35–48 minutes delivers the complete enrichment session at a better per-session cost. The 9" is also the upgrade format for smaller dogs that consistently finish the 6" in under 18 minutes — providing the same session extension logic that the 12" provides for large dogs finishing the 9" too quickly.
The 9" Size — Who It Serves
Primary format for 30–60 lb dogs — Medium and medium-large dogs including Border Collies (30–45 lbs), Australian Shepherds (40–65 lbs), Cocker Spaniels (20–30 lbs as primary dogs at the upper range of their typical treats), Boxers (55–70 lbs at the lower end of their size range), Bulldogs (40–50 lbs), and Labrador-mix medium dogs from 35–55 lbs. For these dogs, the 9" provides the 32–48 minute session range that represents a full behavioral enrichment period.
Transitional upgrade for 6" users — Dogs in the 20–35 lb range that are moderate-to-aggressive chewers finishing 6" sticks in under 18 minutes benefit from the 9" as the upgrade that extends sessions to the 28–42 minute range.
Short-session rotation component for 60–80 lb dogs — Large dogs primarily receiving 12" sticks can use 9" sticks as the shorter-session rotation format — appropriate for days when a brief enrichment session is the goal rather than the full 35–50 minute primary enrichment session.
Breed Applications
Border Collies (30–45 lbs) — High-drive working dogs with exceptional mental stimulation needs. The 9" provides 32–45 minute sessions for Border Collies at their typically engaged chewing intensity. For Border Collies in active training programs receiving daily enrichment sessions as part of behavioral management: the 9" is the format that delivers full sessions without the overkill of a 12" for this size range.
Australian Shepherds (40–65 lbs) — Similar to Border Collies in behavioral needs. The 9" serves the lighter end of the Aussie size range (40–50 lbs) as primary; heavier Aussies 55–65 lbs should use the 12" format.
Boxers (55–70 lbs) — Boxers have moderate-to-high chewing intensity and the 9" typically produces 28–40 minute sessions. Boxers on cardiac-sensitive dietary protocols benefit from the single-ingredient transparency of bully sticks across all sizes.
Bulldogs (40–55 lbs) — English and French Bulldogs at the 40–55 lb size range are typically well-served by the 9" format. Supervise all Bulldog chewing sessions completely given brachycephalic airway anatomy.
Session Duration by Dog Size
| Dog Weight | Chewer Type | Est. Session | Notes |
|---|---|---|---|
| 20–35 lbs | Moderate | 38–50 min | Excellent long session for medium dogs |
| 35–55 lbs | Moderate | 30–45 min | Primary format for this range |
| 55–75 lbs | Moderate | 25–38 min | Good rotation; 12" for full enrichment sessions |
| Any | Aggressive | 15–25 min | Move up to 12" or braided |
Frequently Asked Questions
At 50 lbs with moderate chewing behavior: the 9" is the better primary format. It produces 35–45 minute sessions for a 50 lb moderate chewer — the full enrichment session duration where the behavioral benefit completely develops — at a better per-session cost than a 12" that would produce 45–60 minute sessions that slightly exceed what's necessary. If your 50 lb dog is an aggressive chewer that finishes the 9" in under 22 minutes, upgrade to the 12". If the 9" produces consistent 32–45 minute sessions, it is the correct format. Time your dog's actual session on the 9" after the first few introductory sessions (the first session may run shorter as the dog is exploring a new product) and use that as the basis for the size decision.
From 4–5 months onward with permanent teeth beginning to establish, yes — with complete supervision throughout every session. At 3–4 months with deciduous teeth, the 4-5" format is more appropriate given puppy jaw development; the 9" is suitable once the puppy has reached the 15–30 lb range with adult teeth and established jaw coordination. For the first session with any new puppy, give in a completely supervised 15-minute window and observe that the puppy is working the stick with paw-and-jaw coordination rather than attempting to bite off sections. Remove when the remaining stick is approximately 2–3". The 9" is actually an excellent puppy-to-adolescent format for medium breed puppies (30–50 lb at adult weight) being introduced to long-session chewing from 5–6 months onward.