Salmon oil is good for the brain and it's no different for pets. This is good for their brain, joints, heart, and immune system. I know this is not something that you can see on the outside so it's hard to say it's working. However, I have noticed that after a few weeks of using this, our older dog, Hunter, appears to have more energy and is acting more like a puppy than the 8 year old dog that he is. I would have to say that this is because of starting the salmon oil, as this has been the only change we have done, but I'm really not sure. I guess I would have to continue using it to find out for sure, or stop using it and see how he behaves.
I will tell you this stuff does stink, but I haven't noticed a change in doggy breath. It smells just like salmon does.
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I received this item for free or at a discount for my honest review.
Have a great day!