Carrageenan
Also known as: irish moss extract
A seaweed-derived thickener used in wet/canned dog food that's been controversial for two decades.
What it actually is
A polysaccharide extracted from red seaweed. Two forms: food-grade (undegraded) and degraded (poligeenan). Only food-grade is legal, but degraded carrageenan can form in the gut.
Why it's used in dog food
Cheap thickener that gives canned food its jelly/pâté texture and keeps ingredients from separating.
A bit of history
Used in dairy and processed foods since the 1930s. Removed from USDA Organic certification for human food in 2018 after research linked it to intestinal inflammation. Still legal for pet food.
Pros
- •Effective thickener and stabilizer
- •Plant-based and vegetarian-friendly
- •Cheap
Cons
- •Linked to intestinal inflammation and ulcerative colitis in animal studies
- •Removed from USDA Organic human food in 2018
- •Alternatives (guar gum, xanthan, cassia gum) exist
- •Particularly concerning for dogs with existing GI conditions
Safety notes
Not acutely toxic. The concern is chronic low-grade gut inflammation, especially in IBD-prone dogs.
Sourcing & quality
Look for wet foods thickened with guar gum, xanthan gum, or cassia gum instead.
Commonly found in
Skip this if…
Your dog has IBD, IBS, or chronic GI issues.
The verdict
Avoid if you have the option. Not the biggest concern in most dogs' diets, but worth skipping.