Posting here before I trek over to the vet. Lucy is 16 weeks old. We got her at Christmas and the breeder had her on Diamond Puppy formula. About two weeks ago, I started mixxing the Diamond with Fromm Gold puppy formula (a brand I saw recommended on this site) and am about to go solely on the Fromm.
For several weeks, I've noticed Lucy's hair thinning. There are really any bald patches YET but it's very thin. See attached photo. Is this something I should be concerned about?