My girls were over-weight before getting on raw, so I'm trying to help them slim down. The beef trim we get is very high in fat, since it is the part that gets trimmed off the roasts. My two really do not need that much fat, so I trim off as much excess as I can. There is still enough for basic dietary needs and skin condition, once all is said and done, and also when I'm trimming, I will set aside some little tidbits and toss them to the girls as "candy."
I've been taking the skin off the chicken legs for them, too. I think they do better without it. There is still just enough fat left on to keep them healthy.
The goat meat is very lean, though. I don't add any fat to it, unless I've combined some beef trim into a light meal of goat scraps. The beef trim does have more than enough fat in it for their needs.