Quick answer: Yes. Canine amniotic tissue given to a dog is a same species allograft, while equine tissue given to a dog is a cross species xenograft. Current research does not show that one species’ amnion performs better than another’s, so species matching is the clearest reason to choose canine tissue, alongside the form, processing, and testing of the finished product.
Amniotic tissue products come from more than one species, and veterinarians looking at them for canine patients often ask a fair question: does the donor species make a difference?
Species is a meaningful starting point, mainly because it determines whether a product is an allograft or a xenograft. It is also only one piece of the picture. A sound evaluation looks at the species, the form of the product, how it was processed, and what has been documented in the finished product.
What Is the Difference Between an Allograft and a Xenograft?
These two terms describe the relationship between the donor and the patient.
- Allograft: tissue from a donor of the same species as the patient
- Xenograft: tissue from a donor of a different species
That means canine amniotic tissue given to a dog is an allograft. Equine amniotic tissue given to a horse is also an allograft. Equine amniotic tissue given to a dog, however, is a xenograft.
AlphaFlo® is made from canine amniotic tissue and is intended for dogs, so it is a true allograft for every patient who receives it.
Why Would Matching the Species Matter?
Proteins are built from instructions written in each species’ genetic code. Growth factors, cytokines, and matrix proteins often play similar roles across mammals, but their exact structures are not identical from one species to another.
When a dog receives canine amniotic tissue, the naturally occurring proteins it carries are the canine versions of those molecules, the same species versions the dog’s own body makes. With a cross species product, the patient encounters proteins from another animal.
Amnion is known for a low immunogenic profile, in part because its cells express few or no major histocompatibility complex (MHC) antigens.1 Even so, same species donor tissue is not identical to the patient’s own tissue, and no allograft is free of risk. What species matching does is remove one variable from the decision. There is no cross species question for the veterinarian to weigh or explain to a client.
Do Equine and Canine Amniotic Tissues Contain Different Proteins?
Both contain a rich mix of structural and signaling proteins, including growth factors, cytokines, protease inhibitors, and extracellular matrix components.
Researchers have catalogued well over one hundred proteins in equine amniotic membrane.2,3 Separate work in dogs has identified factors such as hepatocyte growth factor (HGF), TIMP-1, TIMP-2, thrombospondin-1, and IL-1 receptor antagonist in canine amniotic membrane and its extracts.4
There is an important caveat. Those studies used different tissues, different preparations, and different lab methods. That makes them useful for understanding each tissue on its own terms, but not for lining the two species up and declaring one protein profile superior. The current research does not show that one species’ amnion is inherently better than the other’s.
So the strongest reason to choose canine tissue for a dog is not a claim that dog proteins outperform horse proteins. It is the simpler principle of matching the donor to the patient.
What Proteins Are Found in AlphaFlo®?
Several naturally occurring factors have been identified in AlphaFlo®. Each is associated with reported properties of amniotic tissue. For a deeper look at these factors, read our guide to canine amniotic allografts.
| Factor | Associated properties |
|---|---|
| A2M (alpha 2 macroglobulin) | Anti-inflammatory properties |
| IL-1ra (interleukin 1 receptor antagonist) | Anti-inflammatory properties |
| IL-10 (interleukin 10) | Immunomodulatory properties |
| TIMP-2 (tissue inhibitor of metalloproteinases 2) | Antifibrotic and matrix regulating properties |
| MCP-1 (monocyte chemoattractant protein 1) | Immune signaling properties |
| Trappin-2 | Antimicrobial and anti-inflammatory properties |
| EGFR (epidermal growth factor receptor) | Epithelial growth signaling properties |
| VEGF (vascular endothelial growth factor) | Angiogenic properties |
The manufacturing process is designed to preserve the native tissue and retain its naturally occurring proteins.
Does Processing Matter as Much as Species?
In many ways, yes. A dried membrane patch, a membrane extract, and a liquid allograft do not deliver the same material, even when they come from the same species. Processing and storage can also change which proteins remain measurable.
In the canine extract research mentioned above, fresh frozen and freeze dried (lyophilized) extracts differed in measured protein levels and in a laboratory cell culture test, with most measured proteins lower in the freeze dried version.4 Those were lab findings, not a clinical comparison, but they show why the steps between donor and clinic deserve as much attention as the donor itself.
AlphaFlo® is cryopreserved and kept frozen until use rather than freeze dried.
What Should Veterinarians Compare When Choosing an Amniotic Product?
Donor species is a good first filter. From there, it helps to look at the finished product as a whole:
- Donor species: Is it an allograft or a xenograft for your patient?
- Form: Is it a membrane, an extract, or a liquid?
- Processing and storage: Is it cryopreserved, freeze dried, or handled another way?
- Documented proteins: Which factors have been identified in the finished product, not only in the raw tissue?
- Quality testing: How is each lot tested before release?
- Clinical experience: Are there case studies written by veterinarians who have used it?
Why Is AlphaFlo® Made From Canine Tissue?
The team behind AlphaFlo® brings well over a decade of tissue allograft experience across human and equine products, including RenoVō®, a similar product for horses. That background led to a simple design choice: horses receive equine tissue, and dogs receive canine tissue.
AlphaFlo® is manufactured aseptically and tested to USP standards before release. To see how veterinarians have chosen to use it in their own practices, visit our case studies.
Frequently Asked Questions
What is a canine amniotic allograft?
It is a product made from amniotic tissue donated by a dog and intended for use in dogs. AlphaFlo® is a liquid, acellular canine amniotic tissue allograft intended to supplement and protect tissues and used at the veterinarian’s discretion.
Can equine amniotic tissue be used in dogs?
Equine amniotic tissue used in a dog is considered a xenograft. Whether to use any cross species product is a clinical decision for the veterinarian. AlphaFlo® avoids that question because it is canine tissue intended for dogs.
Is canine amniotic tissue better than equine amniotic tissue?
Current research does not establish that one species’ amnion is inherently better than the other’s. The clearest advantage of canine tissue for a dog is species matching. Beyond that, veterinarians should compare finished product data such as form, processing, documented proteins, and quality testing.
Does AlphaFlo® contain stem cells?
No. AlphaFlo® is acellular, so it contains no living cells. It contains naturally occurring proteins found in canine amniotic tissue. Learn more in our comparison of AlphaFlo® and stem cell therapy.
Where does the canine amniotic tissue in AlphaFlo® come from?
Licensed veterinarians recover it during scheduled deliveries, without harm to the mother or her puppies.
How is AlphaFlo® supplied?
AlphaFlo® is cryopreserved, stored frozen, and available in 0.5 cc, 1.0 cc, and 2.0 cc volumes. Use is at the veterinarian’s discretion.
Learn More About AlphaFlo®
Want a closer look at the science behind canine amniotic tissue? Book a Lunch & Learn and our team will bring lunch for your staff and walk everyone through how AlphaFlo® is sourced, processed, and handled.
AlphaFlo® is prescription only and must be administered by a licensed veterinarian. AlphaFlo® may not provide an improvement in the dog’s condition, and there is a possibility of an adverse reaction with the use of any allograft.
References
- Petersen MB, Seibel MP, Freitas EC, et al. Morphological and biomechanical characterization of amniotic membranes across species: equine, canine, porcine, ovine, and human samples. A pilot study. Veterinary Ophthalmology. 2026;29(5):e70236. https://doi.org/10.1111/vop.70236
- Galera PD, Ribeiro CR, Sapp HL, Coleman J, Fontes W, Brooks DE. Proteomic analysis of equine amniotic membrane: characterization of proteins. Veterinary Ophthalmology. 2015;18(3):198–209. https://doi.org/10.1111/vop.12190
- McCoy AM, Arrington J, Yau PM. Effect of preparation method on the protein profile of equine amnion dressings. Journal of Proteome Research. 2019;18(6):2676–2685. https://doi.org/10.1021/acs.jproteome.9b00240
- Permkam C, Suriyaphol G, Sirisawadi S, Tuntivanich N. Biological compositions of canine amniotic membrane and its extracts and the investigation of corneal wound healing efficacy in vitro. Veterinary Sciences. 2022;9(5):227. https://doi.org/10.3390/vetsci9050227