My two are picky with things being added to their food and water but if you add carrots, green beans, or peas with it they love you for it.  They drive me crazy sometimes, they'll dive into an open garbage can and eat rancid chicken but wont take some fish oil on their food!  

We have started fish oil, will be starting vit E soon as I can get it this weekend, I just pop the capsule and squeeze it onto their food, and they refuse to eat.  After they stared at their bowls for almost three meals and refused to eat I gave in.  They love canned green beans, carrots, peas.  So I popped a can of carrots open and added some so they finally ate.  Now instead of just adding fish oil we have added fish oil and whatever veggie I have in the cabinets.

I tried doing ACV in their water for like two weeks and it got to were I would have to leave their full bowl down with only about a 16th of a tablespoon in it for over a day just to force them to drink it.  Then they got smart and figured out they could refuse to drink and when we went for play time at my sisters they got all the ACV free water they wanted because we put a giant bowl of fresh water down for the three and usually have to refill it once of twice before I leave.  So I gave up on the ACV figured its not worth having dehydrated dogs.

Anyone else have trouble giving their pups new things like this?