the bully sticks are effective not because of the chewing action, because most dogs can practically inhale them, but because they are a source of collagen and chondroitin . You must be careful when buying this and make very sure that it is not a product from China as so many "treats" are . Buy only natural , no colour, no preservative, no flavouring , no "smoke" , plain dehydrated . Trachea will provide the same benefits. -- same chemistry as gelatin .
I have a raw pet boutique two roads over that buys boxes full of fresh raw pizzles and then dehydrates them . I can buy them fresh and floppy or dried . She also buys
boxes of trachea with the organs still on . If you are close to an Asian or West Indian grocer you can buy cow skin -- an excellent source of collagen . Or cow's feet which you can boil and have all that gelatin release. Or get yourself chicken carcass with the keel on and either give them these or make a bone broth , essentially making your own gelatin. Cow lips are good .
At this point you could go into a study of bone development. A fetus' skeleton is basically collagen , ossification takes time . This is why hip x rays show differently as the dog ages because the growth plates are cartilage , which can be damaged ! and will show as a gap on the x ray . Bone is ever changing, living , dynamic , responding to nutrition and physcial stresses - weight physical activity . Very interesting research being done in this area to prepare human-kind for living outside of the Earth's gravity on space stations where there is no gravity. Bone will lose its ossification .
So collagen is beneficial to bones , being the material which creates the scaffold for ossification .
Your dogs ears were up so the genetics are there . They fell because the dog had high demands but on his body . By mucking around with the ears you could create a problem by damaging the tissue. Feed well , and wait.