How often you replace a long-lasting chew depends entirely on what it’s made of, but every type has a clear point where it stops being safe. Edible chews like bully sticks and rawhide need replacing once they’re small enough to swallow or after days of accumulated bacteria. Synthetic chews like nylon bones last longer but develop cracks and sharp edges over time. Here’s how to know when each type has reached the end of its life.
Bully Sticks and Collagen Sticks
Bully sticks are one of the most popular long-lasting edible chews, and the replacement rule is straightforward: throw it away when it shrinks to about 2.5 to 3 inches long. At that size, most dogs can fit the remaining piece far enough back in their mouth to attempt swallowing it whole, which creates a choking risk. If you use a bully stick holder, you can let your dog chew it down to roughly 1 to 1.5 inches inside the holder before discarding what’s left.
Beyond size, toss any bully stick that develops a slimy texture, unusual smell, or visible mold. Since these are animal-protein products, they can spoil. If your dog is a slow chewer who takes multiple sessions to finish one, store the stick in a sealed bag in the refrigerator between uses.
Rawhide Chews
Rawhide is one of the most controversial chews because digestibility varies enormously. Lab testing published in the Journal of Nutritional Science found that simulated stomach digestion broke down as little as 14% of some rawhide products and as much as 73% of others after the same period. That means a large swallowed piece of poorly digestible rawhide can sit in your dog’s stomach largely intact, raising the risk of a blockage.
Replace rawhide if your dog has been working on the same piece for more than seven days, since bacteria and dirt accumulate on the chewed surface over that time. Also replace it the moment your dog softens a section enough to tear off a large chunk. Rawhide that becomes gummy and pliable is the most dangerous stage, because dogs tend to rip off pieces too big to digest safely. If your dog is a “gulper” who swallows without much chewing, rawhide is a poor choice regardless of how often you replace it.
Yak Cheese Chews
Yak cheese (sometimes labeled Himalayan cheese chews) are hardened blocks of dried cheese that soften gradually with chewing. Replace them when they’re down to about 3 inches long. At that point, the remaining nub is a swallowing hazard.
One advantage of yak cheese chews is that you can repurpose the leftover piece instead of wasting it. Soak the nub in water for about five minutes, then microwave it for 30 to 60 seconds. It puffs up into a lighter, crunchier treat that’s easier and safer to eat. Let it cool completely before giving it to your dog.
Nylon and Synthetic Chews
Synthetic chews like nylon bones don’t have a set timeline for replacement. Instead, you’re watching for physical signs of breakdown. Replace the chew when you notice any of these:
- Deep grooves or cracks in the surface, which can harbor bacteria and weaken the structure
- Small pieces flaking off, which your dog will swallow
- Overall size shrinking to the point where your dog could fit the whole thing past their back teeth
For aggressive chewers, a nylon bone might last a few weeks. For moderate chewers, it could last months. Check the chew after every session by running your fingers over the surface. If you feel sharp bristle-like edges or can snap off small fragments with your fingers, it’s time for a new one.
Rubber Chews and Treat-Stuffable Toys
Durable rubber chews (like Kong-style toys) last the longest of any category, often months to years. You’re not replacing these on a schedule so much as inspecting them for damage. Look for tears, holes, or chunks missing from the rubber. A dog with a strong jaw can eventually compromise even heavy-duty rubber, and once the material starts breaking apart, small pieces become a swallowing risk.
What rubber chews do need is regular cleaning. The CDC recommends washing pet items as often as you’d wash your own household items. For rubber toys, that means scrubbing with soapy water or running them through the dishwasher if they’re dishwasher-safe. If you stuff them with food, clean them after every use to prevent bacterial buildup inside the hollow center.
Antlers and Bones
Antlers and real bones deserve a separate conversation because the biggest risk isn’t when you replace them. It’s whether you should use them at all. Veterinary dentists warn that these extremely hard chews cause tooth fractures and chips, which lead to pain and expensive dental procedures. A simple test: press your fingernail into the chew. If your nail bends without leaving a dent, the chew is too hard for your dog’s teeth.
If you do give antlers, replace them once they develop sharp edges, splinter points, or get small enough to fit entirely in your dog’s mouth. Antlers that have been chewed down to a smooth, small puck are a choking hazard. Most veterinary dental specialists recommend skipping antlers and real bones entirely in favor of chews that have some give to them.
Signs a Swallowed Piece Is Causing Problems
Even with careful monitoring, dogs sometimes swallow a chunk of chew that’s too large. The signs of a potential intestinal blockage include repeated vomiting (sometimes with bile or a fecal smell), refusing to eat or drink, a visibly swollen or tense abdomen, and no bowel movement for more than 24 hours after the incident. Dogs in pain from a blockage often adopt a “prayer position,” with their front end down and rear end raised, or they may whimper when you touch their belly.
Less obvious signs include unusual lethargy, panting, hunched posture, or reluctance to move. If your dog swallowed a large piece of any chew and shows any combination of these symptoms, that warrants an urgent vet visit. Complete blockages don’t resolve on their own.
A Quick Reference by Chew Type
- Bully sticks: Replace at 2.5 to 3 inches remaining
- Rawhide: Replace after 7 days of use, or sooner if large pieces soften and tear
- Yak cheese: Replace at about 3 inches (microwave the nub for a puffed treat)
- Nylon bones: Replace when cracked, flaking, or too small for your dog
- Rubber chews: Replace when torn or missing chunks; clean regularly
- Antlers and bones: Replace when splintered, sharp-edged, or small; consider avoiding entirely
The single most reliable habit is checking the chew after every session. Pick it up, feel for damage, and compare its size to your dog’s mouth. If your dog could swallow what’s left in one gulp, it’s done.