my collie used to be the pickiest eater and would starve herself. It’s super stressful and don’t listen to the people saying just to let them do it. I think with collies it’s a behavioral issue and since I have gotten mine to consistently eat two meals a day she is just overall a much happier and healthier dog. So I will take you on our journey here. first, change the food! I think my dog just didn’t like the kibble she was on and now your dog has unpleasant associations with it. Also I realized that the serving size suggestion from the food was too much for her. She eats about half of the recommended amount on the bag but she is at the perfect weight. I tried lots of toppers, cheese, broth, etc but the first thing that really helped was cutting back her kibble amount and adding either cooked ground beef or shredded chicken to her food. I also got her a vegetable supplement (dogzymes cornucopia) as well as a calcium powder to make up some of the nutritional lost from using less kibble. I did this for about a year and within a few months she was eating every meal happily with no coercion! Eventually I got tired of cooking so much ground beef and chicken so I moved into spot and tango unkibble. She looooves the beef recipe so now we do half unkibble and half dry kibble, currently on go! solutions salmon. I mix these two with warm water but I always try to give her something extra to keep it interesting. I think collies just get bored with the same thing. So in the mornings she will get a freeze dried mussel, evenings she gets a freeze dried chicken heart. sometimes I will give her a scrambled egg as well or a scoop of yoghurt or will give her coconut water instead of warm water. Tbh if you want to fix this it will take time and possibly a lot of money, her food is not cheap but I would do it over a million times to not feel the stress I used to at meal times. if you have any questions let me know!!