I'm a bigger fan of natural fats than fats out of a bottle or a gel-cap. With that said, it is all about what works for the particular dog you are working at the time.

Two things, usually if the fat goes over the teetering point for that particular dog doing said amount of work then the stool usually loosens up to the point they can pretty much shit thru screen wire.

Second thing is lots of times the dog will run hot. Not so much as the fat is causing it but more so too much fat and not enough protein the dog will not properly recover from day to day and even week to week.

If the dog is doing well with whatever it is you are doing, by all means stick to what is working. I do not know if I have ever seen a dog vomit because of chicken fat but I guess it happens. And it may be the reaction with something else more so than the chicken fat alone.

Best of luck.

EWO