Sorry, this is so long, but please do read it, so that I can sort my dog out.
Dogs:
Westie - Neutered 10 year old male Quite nervous disposition (Unofficial Rescue, had since 2½ years)
Staffy X - Entire 9 month old male. Quite nervous disposition (had since 7 weeks)
2 months ago, I had been feeding my dogs dry food, and they were eating happily, although the Staffy (7 months at that time) tried to snaffle the Westie's food. So I fed them separately, but they'd wait nicely together.
Then, I switched to Raw feeding, and the Staffy had a big go at the Westie. Advice was to feed separately, which I did.
Last month, we had visitors, and one of the children spilt some cake crumbs on the floor. The staff was sat next to me on the sofa, and the Westie wandered past the cake crumbs (nobody had noticed them at that point). Suddenly, the Staffy went for the Westie, from the sofa. Yelping from the Westie, and the result was a small cut on the ear.
The Westie has always been a bit shy, and since then has seemed reluctant to eat unless he is shut away. So I feed him in the porch. I normally put their kibble in a bowl, call both dogs, then put the Staffy's down to him. Once he is eating, the Westie is willing to walk past him to the porch, and I shut him in.
Last night, I called the Westie, and the Staffy was waiting for his dinner, much like any other night. Eventually the Westie appeared, but by then I was holding both bowls in one hand. I think the Staffy must have thought I was going to give both bowls to the Westie, because he attacked the Westie.
It wasn't just a 'putting in place'. It was an attack. He flew across the kitchen and pounced on the Westie. Full snarling, shaking him by the neck, continued growling while the Westie cried and pooed himself
I tried yelling, I tried everything. I even kicked the Staffy gently, to try and distract him
I was desperate - I thought he was going to kill him. He wasn't even there, if you know what I mean. DH came down and grabbed the Staffy's collar, but when he tried to lift him away, he actually lifted the Staffy and the Westie because the Staffy had such a hold on him. Fortunately, my head cleared and I remembered someone saying about sticks at the back of the jaw. I grabbed a bannister spindle (diy) and gently pushed it into his jaw. He let go, I got the other dog out into the garden, and then DH let him go. He was panting furiously, but looked completely dazed. Like he'd woken up from a dream.
The Westie was actually not badly harmed. Lots of saliva on him, and there was blood, but some was from the Staffy's head (the Westie had managed to nip him) and I think the other was from the Westie's mouth, where he must have bitten onto the Staffy's buckle on his collar.
They socialised cautiously after that. The Staffy sniffed the area where he'd grabbed the Westie. The Westie was withdrawn, but polite. They happily sat in the car together today while we went into a shop, and they enjoyed a walk together.
Tonight though, I fed the Westie before letting the Staffy in from the garden. The Staffy had finished his dinner long before the Westie had. Once I opened the door of the porch, to let the Westie out into the garden, the Staffy approached in a friendly manner, but it seemed that as soon as he smelled the Westie's breath and realised he'd eaten, it set him off again. He started to nip him on the back of the neck and was going to have a go at him, but I was able (after doing lots of reading last night on appropriate responses to dog fighting) to keep my voice low but firm and called him away, with a 'don't you dare' added.
I don't want this to escalate. But obviously the Staffy is starting to have real issues with food. Incidently, he's fabulously submissive with people, and is very submissive to the Westie if he puts him in his place generally. I can take food from him freely (for instance, I forgot to add his antibiotic one day, and took his food away to crush the antibiotic into it, and he was fine), and he sits and waits for my command before eating his food.