Why is my golden hair like this?

How old is your dog? This is a sign of dog food protection. My blonde sister is two years old. She used to freak out when she saw food. She can't disturb it while eating, otherwise the consequences will be very serious. Everything will return to normal after eating. Later, the veterinarian asked me to feed it, that is, I fed it with a spoon. I fed it small pieces of watermelon, so it won't get all over the floor. It was crazy at first, but it must not be urgent. I tied it up and fed it, and then it gradually recovered and stopped protecting food. Now I give him a bowl to eat, and he doesn't respond.