Hi I just want to say that the RC food caused my pup to have the runs. He is roughly the same age as yours. I was told by a dog nutrition guy at the pet smart to put him on it for dander.I added it gradually but I had to take him off of it.
I also had gradually put my other two year old on the adult RC and and he got the runs as well. I went back totally to the Performatrin puppy and adult food I get at the Pet Valu store.
Good luck anyway
You have a lot on your plate with an eight month old baby and a puppy. You actually have two little babies to take care of.