Petterm LearnAll Petterm learn articles and ingredient guides.https://petterm.com/7 Signs Your Cat's Gut Health Needs Attentionhttps://petterm.com/learn/cat/digestive-health/cat-gut-health-signs/https://petterm.com/learn/cat/digestive-health/cat-gut-health-signs/From soft stools to a dull coat, your cat's gut sends signals before problems escalate. Learn to read the 7 key signs of poor feline gut health and what each one means.Sun, 19 Apr 2026 00:00:00 GMTWhy Cats Get Hairballs — And What Actually Helpshttps://petterm.com/learn/cat/digestive-health/hairball-causes-and-prevention/https://petterm.com/learn/cat/digestive-health/hairball-causes-and-prevention/Hairballs aren't a grooming problem. Learn the digestive and motility science behind feline hairballs and what diet, fiber, and probiotics can do about them.Sun, 19 Apr 2026 00:00:00 GMTBest Wet Food for Indoor Cats: What to Look For (And What to Skip)https://petterm.com/learn/cat/nutrition/best-wet-food-for-indoor-cats/https://petterm.com/learn/cat/nutrition/best-wet-food-for-indoor-cats/Indoor cats have specific nutritional needs that most wet food labels don't explain well. Learn the ingredient and nutrient criteria that actually matter for indoor cat health.Sun, 19 Apr 2026 00:00:00 GMTSenior Dog Muscle Building: The Exercises That Actually Workhttps://petterm.com/learn/dog/exercise-fitness/senior-dog-muscle-building-exercises/https://petterm.com/learn/dog/exercise-fitness/senior-dog-muscle-building-exercises/Muscle loss in aging dogs is inevitable — but the rate is not. A structured low-impact exercise protocol can rebuild and maintain lean mass in dogs over 7. Here's what works.Sun, 19 Apr 2026 00:00:00 GMTWhat Is Porphyrin? The Science Behind Your Dog's Tear Stainshttps://petterm.com/learn/dog/health-wellness/porphyrin-in-dogs/https://petterm.com/learn/dog/health-wellness/porphyrin-in-dogs/Porphyrin is the iron-containing molecule responsible for the rust-colored staining under your dog's eyes. Learn what it is, why dogs produce it, and what influences how much.Sun, 19 Apr 2026 00:00:00 GMTWhite Dog Tear Stains: Which Breeds Get Them and Whyhttps://petterm.com/learn/dog/health-wellness/white-dog-tear-stains/https://petterm.com/learn/dog/health-wellness/white-dog-tear-stains/Bichons, Maltese, Poodles, Shih Tzus — white-coated breeds share anatomy and coat chemistry that makes tear staining nearly inevitable. Here's the breed-by-breed breakdown.Sun, 19 Apr 2026 00:00:00 GMTL-Lysine for Cats: What It Does, What It Doesn't, and Why It's Still Usedhttps://petterm.com/learn/ingredients/l-lysine-for-cats/https://petterm.com/learn/ingredients/l-lysine-for-cats/L-Lysine is widely included in feline eye and immune support formulas. The evidence is more nuanced than the marketing suggests — here's a clear-eyed look at what it does.Sun, 19 Apr 2026 00:00:00 GMTLactoferrin for Pets: The Iron-Binding Protein Behind Tear Stain Reductionhttps://petterm.com/learn/ingredients/lactoferrin/https://petterm.com/learn/ingredients/lactoferrin/Lactoferrin is a glycoprotein naturally found in tears and milk. Learn how it works as an iron-binding and antimicrobial agent, and why it appears in tear stain supplements.Sun, 19 Apr 2026 00:00:00 GMTPsyllium Seed Husk: The Soluble Fiber That Supports Feline Digestionhttps://petterm.com/learn/ingredients/psyllium-seed-husk/https://petterm.com/learn/ingredients/psyllium-seed-husk/Psyllium seed husk is a soluble fiber used in digestive and hairball formulas for cats. Learn how it works, why it's included, and what to expect from daily use.Sun, 19 Apr 2026 00:00:00 GMTProbiotics for Cats: 7 Benefits Beyond Digestion You Should Knowhttps://petterm.com/learn/cat/digestive-health/probiotics-for-cats/https://petterm.com/learn/cat/digestive-health/probiotics-for-cats/Cat probiotics do more than settle stomachs. Learn 7 evidence-backed benefits of feline probiotics, from immune support to hairball reduction, and how to choose the right formula.Mon, 13 Apr 2026 00:00:00 GMTMuscle Loss in Senior Dogs: Signs, Causes, and What You Can Do About Ithttps://petterm.com/learn/dog/exercise-fitness/helping-underweight-dogs-gain-muscle/https://petterm.com/learn/dog/exercise-fitness/helping-underweight-dogs-gain-muscle/Canine muscle atrophy affects most aging dogs. Learn why it happens, how to spot it early, and the nutritional and exercise strategies backed by veterinary research to slow or reverse it.Mon, 13 Apr 2026 00:00:00 GMTHow to Get Rid of Tear Stains on Dogs and Cats: A Science-Backed Guidehttps://petterm.com/learn/dog/health-wellness/tear-stain-causes-and-solutions/https://petterm.com/learn/dog/health-wellness/tear-stain-causes-and-solutions/Tear stains aren't just cosmetic. Learn what causes brown or red streaks under your pet's eyes, which breeds are most affected, and the internal and external strategies that actually work.Mon, 13 Apr 2026 00:00:00 GMT