My 4.5 month old puppy is very aggressive at feeding time!

Question
Hello! I hope you can help me with a problem I'm having with my 4.5 month old Lurcher/Border Collie cross dog. He's a very friendly dog, gets on fine with other dogs and everyone comments on how friendly he is when we're out walking. He really is a delight...until feeding time. As soon as I open the food cupboard door he gets very aggitated and snappy. I have to try to keep my face away from him as I get his food out just in case he catches me with his teeth. I then put out some food in his dish on the worksurface-I can't do it on the floor as he rips the bag open. He'll then jump up to the worksurface and try to steal his food before I give it to him but I give him a few stern 'NO!'s until he stops. I read somewhere that a dog has to feel like they've earned their food so I get him to 'go to bed', 'sit', 'lie down' and 'stay' then I give him his food. If I go anywhere near him while he's eating, even if I'm more that a metre away from him he tries to wolf his food down at top speed, growls really loudly, shows his teeth, urinates and bites my foot repeatedly so hard that he's punctured my leather trainers and other leather shoes on several occasions and even makes his own mouth bleed because he's biting so hard. Of course he hurts me too. I gave him a pressed knuckle bone to chew on for the first time ever today and happened to walk by him in the front room while he was chewing it & he again started showing his teeth and growling really loud, attacked my foot (luckily I had my trainers on), and he bit right through the leather again, cutting my foot through the sock too and I noticed his blood on my trainer afterwards. I took the bone off him eventually by kicking it away & picking it up quickly. I won't be giving it back to him any time soon for fear of another attack. I asked my vet for advice but she said that he should be fed in another quiet room where he won't be disturbed as he's obviously trying to protect his food. I'm hoping to start a family within the next 2 years or so & would hate to think I'd be putting a baby/child in danger if they wandered anywhere near him while he's chewing/eating. I know it's the owners that need the training more than the dog & am aware that this problem could be something I've created myself without even realising it but I just don't know what to do. I daren't walk around my home without footware on for fear of him ripping up my feet! He's very well behaved for a 4 month old in every other respect, of course he chews everything but I know that's just his age. He goes straight back to normal after he's eaten all his food and isn't too bothered about me picking up his food bowl either. As I said earlier, he's friendly with other dogs, always looking very subservient in front of them & is friendly with other people too, probably a bit too friendly & excitable if I'm honest. He's getting better at walking on his lead (he still tries to pull a lot) but gets a bit too excited when he sees other people/dogs. His tail wags so hard that he can hardly stand sometimes! I always make sure that I eat before the dog does, I then feed my two cats & Dougal last. I always make sure he goes through stiles/gates/doors after me when we're out walking and he's not allowed on the sofa/chairs or upstairs in our home & he has his own cushion to sleep on in a quiet corner of the front room. I can feed him treats by hand when he's learning new thing as long as I remind him to take it from my fingers 'gently', otherwise he nearly eats my hand! Please, if you have any advice at all, please let me know. I don't want to be afraid of my dog in any circumstance, I hope that he's still young enough to be trained not to behave like this anymore or for me to alter whatever I'm doing to stop this behaviour. Many thanks & I'm sorry the question is so lengthy, I figured I'd better write as much as poss to give you a good idea of the problem. Thank you again! Kindest regards from Jan.

Answer
One thing that you can do is to only put part of his meal in the dish.  Then when he is finished, take the bowl and add more.  He will begin to associate having you touch his bowl with getting more food.  

Keep working on the obedience.  Take a look at this site too, http://www.dogbreedinfo.com./topdogrules.htm