Background: I have a Great Dane who will be a year old this July. He has lived w/us since 8 wks. He has been pretty well potty trained w/an occasional accident (which has usually probably been my fault). We recently had to take in my boyfriends old dog (the ex-wife got him in the divorce) b/c he has a number of separation anxiety issues and she no longer felt able to deal with it. So it was either we take him, or he's put down. So we took him. He is a great family dog-black lab/retriever mix who is about 9 years. My problem is, I think my Dane is (obviously) jealous. Now, we give them both equal attention (if anything, the Dane gets more)and feed them in separate dishes, buy two of everything for sharing, etc....
Problem: My Dane (Charlie) will seemingly, spitefully pee when he is jealous. EX: Charlie had already eaten his food one evening (for whatever reason the lab (Lincoln) hadnt had his yet) and when my BF went to feed Lincoln, and told Charlie no, it wasnt his, he looked right at him and peed. EX 2: I called both dogs to me one afternoon and Charlie wouldnt come (being stubborn)so when Lincoln came, I lavished him w/praise for coming on his command, and Charlie came over and peed right in front of both of us. On top of all this, Charlie was just neutered only about two weeks ago. (Im sure it plays some part in this) And though he had no problems when he was alone/younger, Charlie now seems to have an eating phobia, even though he's given the "OK" command to eat and praised when eating his own food, he will pee if I approach him anymore while eating. (We did a lot of conditioning with touching his face, taking food away, etc while eating as he was growing up--we have two small children and u cant have a big dog like that w/out being really careful)
I would be extremely greatful for any suggestions as to how NOT to make this situation worse, anything I can do for either dog to make these transitions more acceptable for both of them. I am no expert but have had dogs all my life and am no idiot when it comes to training/obedience/dog-thinking. But this seems to be beyond my understanding as I dont know how to handle all these diffent issues all at once.

