i have a chocolate lab that will be turning 7 years old in April. he was always kind of a fat dog who was rowdy and ate whatever he could find; food, paper, toys, etc. i haven't seen him since this Christmas and it is now February third. when i saw him he was normal-fat, hungry, and so energetic he knocked me over. today i was him again for the first time since. when i looked at him i broke down and cried. he is skin and bones. he was a fat dog as i said and in a month he must have lost 30 pounds. i also noticed that when he gets up to walk it hurts him. he wont eat and when he does its only bits and pieces of table food. he had eaten a knuckle bone two weeks earlier and that is when my mom noticed all this happening. she thought it was a worm so she gave him and three day worm oral treatment. i don't think that is the case. she also thinks the bone could have hurt his throat so he doesn't want to eat because it hurts going down. another thing i am thinking, but hoping its not, is cancer. we have checked him multiple times for lumps but there are none. his poop is regular and there is no bleeding at all. please please please help me my poop puppy is so skinny and i know hes hurting. we cant afford to make him under go surgery at the vet but my mom is contemplating taking him there. please tell me if there's anything i could do or if you know whats wrong with him!! this is my only hope. thank you so much!