What Are Collagen Sticks for Dogs Made Of? | Beef Dermis Chews Explained

If you’ve seen these stiff, pale chews at the pet store and wondered what sets them apart from the rawhide or bully stick aisle, the short answer is the source material. Collagen sticks use the beef hide’s inner layer—the part that sits between the tougher outer skin and the fat—rather than the chemically processed outer layer rawhide is made from. That distinction matters for digestibility, safety, and what your dog actually gets out of the chew.

The Corium: What Beef Dermis Actually Is

The corium is the thick, fibrous middle layer of cattle skin. It’s the part that gives hide its strength and flexibility, and it’s naturally packed with collagen protein—specifically Type I and Type III, the same structural proteins that support joints, skin, and connective tissue in dogs.

Collagen sticks are distinct from rawhide, which uses the cow’s outer skin layer and is often processed with chemicals to remove hair and soften the material. While rawhide can be hard to digest and carries a higher choking risk, collagen sticks start from the clean inner corium, are minimally processed, and soften as the dog chews, making them fully digestible for most dogs.

Processing: From Hide to Chew Without Chemicals

Single-ingredient collagen sticks are made by cleaning the corium layer, then drying or slow-roasting it at controlled temperatures. The heat preserves the protein matrix while killing any potential pathogens. No bleaching, no glue binders, no chemical softening agents—just beef skin, trimmed and roasted. Some brands use hydrolyzed collagen peptides (broken-down protein chains) for easier digestion, though the traditional roasted form works fine for most dogs.

Because the material is pure beef dermis, single-ingredient sticks are naturally grain-free, gluten-free, and suitable for dogs with food sensitivities.

If you’re comparing brands and want to know which ones hold up best, check out our tested roundup of the best collagen sticks for dogs on the market—it covers size, density, sourcing, and which types suit different chewers.

How They Compare: Collagen Sticks vs. Bully Sticks vs. Rawhide

It’s easy to confuse these three chews because they all come from cattle, but the differences matter:

• Collagen sticks: Made from the beef dermis (corium). Up to 95% collagen protein. Minimally processed, fully digestible, soften as chewed. Natural glucosamine and chondroitin present.
• Bully sticks: Made from pizzle (bull penis muscle). Protein content around 60–70%. Fully digestible but very dense and calorie-heavy. Distinct smell.
• Rawhide: Made from the cow’s outer skin layer. Often chemically bleached or bonded. Hard, difficult to digest, and a known choking hazard for aggressive chewers.

What To Watch For: Size, Calories, and Supervision

Collagen sticks come in sizes from 6 inches (small dogs) up to 24 inches (large power chewers). The calorie density is high because they’re nearly pure protein and fat—moderation matters, especially for dogs on weight management plans. Stick to one chew every few days, not daily, unless your vet says otherwise. Always supervise chewing sessions; any chew that gets small enough to swallow whole is a choking risk, so swap it for a fresh one when it becomes a nub.