How to Choose Fish Oil for Cats? Benefits, 4 Key Buying & Feeding Tips!

What Is Fish Oil for Cats? Why Should You Supplement It?

Fish oil for cats is typically extracted from deep-sea fish (such as cod, mackerel, and salmon) or algae, and is rich in Omega-3 fatty acids including EPA (Eicosapentaenoic Acid) and DHA (Docosahexaenoic Acid). These are “essential fatty acids” that cats cannot produce on their own and must obtain through diet or supplements.

Cats are obligate carnivores and have a lower ability to convert fatty acids compared to humans and dogs. If Omega-3 is lacking in their diet, the following issues may occur:

• Dry & Dull Coat
• Itchy & Inflamed Skin
  
• Weakened Immune System
  
• Joint Stiffness
  
• Age-related Cognitive Decline

Therefore, appropriate supplementation with fish oil for cats can be part of a daily wellness routine to help maintain overall health.

6 Key Benefits of Omega-3 for Cats

1. Strengthens the Immune System

Omega-3 has anti-inflammatory properties that help regulate immune responses and reduce chronic inflammation.

2. Improves Coat Shine and Skin Health

Supplementing cat fish oil can help relieve dryness, excessive shedding, and itchy skin, leaving the coat softer and shinier.

3. Anti-inflammatory and Joint Protection

EPA helps reduce inflammatory responses associated with arthritis, making it especially suitable for senior or highly active cats.

4. Supports Cardiovascular and Kidney Function

Omega-3 helps maintain healthy blood lipid levels and circulation, and may provide supportive benefits for cats with chronic kidney disease.

5. Brain Development and Cognitive Support

DHA is essential for kitten brain development and may also help slow cognitive decline in senior cats.

6. Maintains Vision and Retinal Health

DHA is a key structural component of the retina and plays an important role in visual development and protection.

How to Choose the Right Fish Oil for Cats? 4 Key Factors to Consider!

1. Cat’s Age and Health

• Kittens: Choose products with higher DHA content
• Senior cats: Look for joint-support and anti-inflammatory formulas
• Cats with chronic conditions: Consult a veterinarian first

2. Body Size and Activity Level

Cats with higher body weight or activity levels may require different Omega-3 dosages. Adjust according to product guidelines.

3. Omega-3 Concentration and Purity (EPA + DHA Content)

Focus on the actual EPA + DHA content rather than just the total milligrams of fish oil. Clear labeling of concentration indicates higher reliability.

4. Product Form

Feeding Dosage and Precautions for Cat Fish Oil

• Follow your cat’s body weight and product instructions

• Start with half the recommended dose for the first 7–10 days

• Avoid overdosing, as it may cause soft stools

• Cats with kidney disease, heart disease, pancreatitis, bleeding disorders, or those on anticoagulants should consult a veterinarian first

• If persistent vomiting, severe diarrhea, or lethargy occurs, stop use immediately and seek veterinary care 

Which Fish Oil for Cats Is Best? 3 Recommended Options!

	Product Features
	Fish Oil Recommendation 1. VetriScience - Omega 3,6,9 Pro Broad-spectrum supplement (omega-3, 6, 9) for overall health (skin, coat, joints, heart). Comes in soft chews or liquid for easy administration. Ideal for pets needing general EFA support, without specific skin conditions.
	Fish Oil Recommendation 2. VetPlus - Coatex (Skin & Coat Supplement) Focused on omega-3 and 6 (with GLA) to address skin and coat issues like itching or allergies. Available in capsules, specifically for pets with dermatological needs. Targets inflammation and skin health but lacks omega-9.
	Fish Oil Recommendation 3. NAS - Omega 3, 6, 9 Oil   100% natural blend (omega-3, 6, 9) with no additives or preservatives. Comes in liquid form, suitable for mixing into food. Perfect for owners seeking a more natural, minimally processed option for general health.

Storage Tips and Feeding Advice for Cat Fish Oil

1. Storage

• Avoid direct sunlight
• Keep tightly sealed
• Store in a cool, dry place
• Consume within 1–2 months after opening

Fish oil can oxidize due to light, heat, and air exposure. Proper storage helps maintain quality.

2. Feeding Tips

• Cut open capsules and mix into wet food
• Start with a very small amount
• Feed together with regular meals
• Avoid feeding on an empty stomach to reduce digestive upset

If severe diarrhea or vomiting occurs, discontinue use and consult a veterinarian.

Besides Fish Oil for Cats, What Other Ways Can You Supplement Omega?

Although fish oil is the most common and stable source of Omega-3, cats sensitive to fish flavor or with delicate digestion may consider alternative Omega fatty acid sources. However, not all plant-based Omega sources are suitable for cats.

	Product Features
	1. Fourflax - Flaxseed Oil Plant-based source with up to 60% Omega-3 to support body balance and reduce inflammation Helps improve dry skin, hair loss, sensitivity, and joint health 100% plant oil, cold-pressed and non-fishy, ideal for pets sensitive to fish oil taste
	2. Fourflax - Omega-7 Up Oil  Advanced plant-based formula with Omega 3, 6, 9 + Omega-7 Supports cardiovascular health and metabolic function Helps improve skin, coat condition, and overall body balance within 14 days

Frequently Asked Questions About Cat Fish Oil

1. Do cats need to take fish oil every day?

For general wellness, daily supplementation is acceptable, but always follow recommended dosages.

2. Can cats take human fish oil?

Not recommended. Human fish oil products often contain higher doses and additives unsuitable for cats.

3. If my cat is already taking other supplements, can I add fish oil?

Yes, but avoid overlapping nutrients or excessive intake. Consult a veterinarian if unsure.

4. What if my cat refuses the taste of fish oil?

Start with a very small amount mixed into wet food and gradually increase. You may also choose products with milder odor.