1 day after amputation and still not eating

My Leopard had one of his front legs amputated Monday. He’s been home for a whole day and has only eaten like a teaspoon of wet cat food. Is this normal? I called the vet and they said if he hasn’t eaten by the morning they could give him an appetite enhancer. He just seems really sad. I crawl in his enclosure and pet him and even take him out and hold him on my lap and pet him.

https://preview.redd.it/rwmwyklv75zc1.jpg?width=3024&format=pjpg&auto=webp&s=ffdcc6869883bd151d4febe99be85ecd54409fde