Dr. Katherine Mercer Facebook ad: “Your Dog's Summer Allergies Explained ^”

Ran for 52 days, from July 21 to September 11, 2026, the last day Crush saw it.
Run by Dr. Katherine Mercer on Facebook. Crush is not the advertiser and does not verify its claims. See this ad in Meta's Ad Library(opens in a new tab)
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About this ad
- Meta Ad Library ID
- 1528105205995660
- Platforms
- Facebook, Instagram, Audience Network, Messenger and Threads
- Relaunches
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Ad text
I had a dog owner in my office last week who broke down crying before I even finished my examination. She was not crying because of bad news. She was crying because of what I told her about the last three years. She had spent $14,000 on allergy treatments. Three different vets. Apoquel. Cytopoint. Two food changes. Probiotic supplements. Medicated baths. Allergy testing. Monthly vet visits. And every summer her dog got worse. She came to me because her regular vet finally referred her to a dermatologist. Which is what should have happened three years ago instead of three years and $14,000 later. I looked at her dog. I looked at the chart. And I told her what I am about to tell you. My name is Dr. Katherine Mercer. Veterinary dermatologist. 15 years at Whitmore Animal Hospital. The first thing I said to her was "I need to show you something nobody has shown you." I pulled out a piece of paper. I drew the skin barrier. I drew the collagen wall. I drew the gaps. I explained the mechanism. I explained why every medication she had used for three years suppressed the immune response without rebuilding the structure. I explained why every summer was worse. Because the wall lost another year of collagen while the medications masked the consequences. And then I asked her the question I ask every new patient. "In three years of treatment has anyone told you about the skin barrier?" She shook her head. "Has anyone used the word collagen in relation to your dog's allergies?" No. "Has anyone explained that every medication your dog has been on suppresses the immune response but does not rebuild the barrier?" No. "Has anyone told you that the barrier is getting weaker every year while the medications try to keep up?" No. She started crying. Not because she was sad. Because she was angry. Three years. $14,000. Four vets. And not one of them told her the barrier existed. I see this every single week. Every new patient who walks through my door has the same story. Years of medication. Thousands of dollars. Nobody mentioned the barrier. Nobody mentioned collagen. Nobody explained why everything kept failing. And I understand why. Because the barrier explanation does not end with a prescription. It ends with a $30 bottle of liquid collagen that the owner orders online. There is no vet visit for that. No dispensing fee. No follow-up prescription adjustment. No recurring Cytopoint injection appointment. The solution to barrier failure does not generate revenue for the veterinary practice. That is not a conspiracy theory. It is an economic reality. And it is why most dog owners go years without hearing the word collagen. I decided years ago that I was not comfortable with that reality. So I changed my practice. Every allergy patient who walks into my office gets the barrier explanation. Every single one. I draw the diagram. I show them the wall. I explain the collagen types. I explain why medications suppress the response without touching the structure. I explain why every summer is worse. And then I tell them what the barrier needs. Liquid collagen. All three types. 98 percent absorption. Not chews. Not powders. Not the collagen supplements on Amazon that are underdosed with the wrong types and 20 percent bioavailability. Liquid. With all three types. At therapeutic doses. From a source that has been independently verified. I tested six collagen products over three years. Five failed lab testing. One passed. Healthy Petz Liquid Collagen. All three types. Liquid. 98 percent absorption. Third party tested every batch. That is what I recommend. That is what I started putting my patients on three years ago. And the results have been the most significant clinical improvement I have seen in 15 years of dermatology. Let me tell you about the woman who was crying in my office. I started her dog on Healthy Petz Liquid Collagen that week. One serving on food alongside the existing Apoquel. She called me at week three. The overnight scratching had decreased significantly. She was cautious. She had been let down before. She called me at week five. The ears were clean for the first time in eight months. She checked them every morning expecting the brown gunk. Nothing. She came in at week eight. I examined the dog myself. Coat improving. Belly skin lightening from dark grey back toward pink. Paws clean. No hot spots. I started tapering Apoquel at week ten. Half dose. No increase in scratching. Week twelve. Quarter dose. Still stable. Week fourteen. Off Apoquel completely. Then June arrived. Summer. The season that had destroyed her dog for three consecutive years. Each summer worse. Each summer more medication. Each summer more money. This June was different. The pollen spiked. The grass came in. The allergen load peaked. Her dog did not fall apart. No hot spots. No ear infections. No medication increase. No emergency calls. The dog played in the yard in June. She sent me a video. The dog was running through the grass. The same grass that had been destroying her skin for three years. Because the wall was rebuilt. The pollen hit the barrier and stayed on the surface. The immune system had nothing to attack. One serving of collagen on food. $17 a month. After three years and $14,000 in medications that suppressed the response while the wall collapsed underneath every single dose. This is not an isolated case. This is the pattern across my entire collagen patient population. The patients who get collagen improve. The patients who stay on medication alone decline. The gap widens every year. Summer is the proof. It is the annual stress test that reveals exactly how much barrier was lost. And every year the medication-only patients fail the test worse while the collagen patients pass it better. I am not telling you to stop your dog's medication. Do not do that. The medication has a role. It manages acute symptoms while the barrier rebuilds. I am telling you to add collagen. Alongside whatever your dog is on right now. One serving on food. Let the wall start rebuilding underneath the medication. Three to four weeks and you will hear the difference at night. The scratching will slow. The jingling will decrease. Six to eight weeks and you will see the difference. Ears staying clean. Paws less red. Hot spots not cycling back. By next summer the wall will be stronger than it is right now. The allergens will hit a better barrier. Less will get through. The medication will work better or become unnecessary. shophealthypetz.com/products/liquidcollagen $30 a bottle. $17 on the multipack. Buy 2 Get 1 Free right now. 60 day money back guarantee. That woman stopped crying by the end of the appointment. Not because I fixed her dog in 45 minutes. Because for the first time in three years someone explained what was actually wrong and gave her a real path forward. The barrier is the problem. Collagen is the fix. Summer proves it every single year. — Dr. Katherine Mercer, Veterinary Dermatologist, Whitmore Animal Hospital, 15 years EDIT: Buy direct from their website only. Do not purchase collagen from Amazon. shophealthypetz.com/products/liquidcollagen
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Your Dog's Summer Allergies Explained ^
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