Dog won't eat but not sick?

I have a 9 mo. old mini dachshund. i have had him since he was 13wks. he has a needy personality and he likes to be with me where ever i go. i noticed a long time ago that he doesn’t eat unless i’m in the same room as him. if i left the room after i put his bowl down he would grab a mouthful of kibble and follow me and eat little pieces while did whatever i needed until i returned to the room where his food was and he would continue eating.

it was never a problem because i was only working part time. now that i’m working full time he goes hours without eating or drinking until i get home. I’ve tried to get people he knows to come in and feed him but he refuses. he will only eat when i am there. recently my mom came to visit and she let him have some of the fat from her bbq because she read somewhere it makes their coat shiny even though i told her not to.

since then he refuses to eat his dog food. he drinks water and hasn’t touched his dog food. i thought he was eating but instead he was just grabbing mouthfuls and hiding it around the house. i took him to three different vets. all gave him a clear bill of health and one gave me a liquid formula to increase his appetite.

everyone tells me that a healthy dog will not starve himself but he went from 10 pounds to 8 pounds between the first and second vet visit. and from 8 pounds to 7 pounds on his third visit. they tell me not to coddle him and to stay firm with his feeding times.

i broke down and gave him some people food, yogurt and turkey. he ate like he was starving (since he hasn’t eatten for three days)

what would you do?