[outworlder]

> Is interesting that cats don't have it. Points to something that is not present in the outdoors and environment. Cat food have also a lot of salmon and other fish.

If this is an infection, we can draw no such conclusions. If it is food, it still doesn't help much – perhaps excluding some food components.

[pvaldes]

Many homes have both pets. In those cases cats steal dog food gladly and would be poisoned also. Cats have often lower weight so should be dying more easily than dogs. Is interesting because is not happening (apparently).