I would leave the food alone for now, he's adjusting to enough already.
Wait a month or so and then try another food. My 4 dogs ate beneful and mighty dog and they lived to be 14-18 years old, so another month on junk food isn't going to hurt him.
As for the milk bones, maybe try the mother Hubbard version.
Lola eats health extension little bites and fresh pet rolled food, it took a long time to find food she'd eat. |