I have a 9 week oak grey squirrel I have been rehabing since he was 2 weeks old. (And I have rehabbed other squirrels previously for release- but this particular issue I have not previously encountered). He's on puppy Esbilac (and has been doing quite well with a normal growth rate curve). He's now also has rodent block (which he seems to not really like) and a variety of fresh veggies (from the approved list). Last night he refused the milk for the first time yet was still very active. However is acting very lethargic today. Just not his active self. He did drink ~10 ml of the milk this morning. He is also drinking water out of his bottle and urinating. There's less stool than normal. He's also being very cuddley and just wants to be held (which is NOT normal for him).
Any ideas what might be wrong? MBD maybe? Constipation?