I have started mixing suet in with his feed. I just feed him table scraps, oats, dry peas, nuts, fruit... whatever! I started with the suet 4 days ago. He weighed 11.2 ounces. Today he weighs 12.7 ounces and seems to have had a growth spurt; he is also much more active. could this mean he was deficient in nutrients before? He eats the suet before anything else. It is home rendered suet from grass fed cows. He is fatter too, but most notably he is bigger and it happened in just a few days.