I use Missing Link Feline for my cats, Missing Ling Canine for my dogs, and Udo's Choice (same manufacturer) for myself.
I find non rancid essential fatty acid supplements to be the single greatest thing I can do for myself, and feel no differently for my animals. I can literally see and feel the difference in myself in myriad ways. Essential fatty acids contribute to the integrity of the cell walls in every body system and body function. The only question one should be asking is whether the EFA's are non rancid or not.
Heat, light, and air cause EFA's to degrade. So the manufacturing, shipping, and retail display of said products is crucial to whether or not they retain their beneficial properties.
Liquid EFA's in bottles or capsules that are non refrigerated at any stage go rancid extremely quickly, so that rules out cod liver oil, fish oil capsules, etc.
Processing renders EFA's rancid, so commercial pet foods don't cut it either. Even if the EFA's are sprayed on in the very last stage of production the foods are still transported in hot trucks and stored in warehouses.
The Missing Link pet products were designed precisely to fill the void in EFA products for animals. The manufacturing process, the packaging, the product form- all were designed the way they are for a reason- to be able to deliver non rancid EFA's to consumers without need for refrigeration in shipping and display.
I sound like a commercial, I know. There is a whole lot of information available to anyone who wants to pursue the topic further... the book "Fats That Heal, Fats That Kill"
by Udo Erasmus is widely considered to be an excellent introduction to the topic.
I found this online interview with him- it is a good place to start if you only have a moment.http://www.positivehealth.com/permit...iews/udo12.htm