Hello, I've not posted before, but thought I may be able to give some help here. My horse (16.2 hunter type) trod on my GSP's foot whist out riding, she screamed her head off for about 30 seconds, and wouldn't put her foot on the floor. Stupidly, I hadn't taken my mobile out with me, so had no choice but to ride back to the stables to get her some help. I thought about picking her up and carrying her across the front of the saddle to get her home, but understandably, she wasn't too keen on getting near the horse again! She wouldn't stay either, so she acompanied us back to the stable, trotting along side, and although limping (to start with on 3 legs), she managed to keep up just fine, and the nearer we got to home the less she was limping.
By the time I had put the horse away, and was intending to take her straight to the vets, she seemed much better, still limping, but not in any distress, and asking others on the yard to play, bringing them toys!
Decided to leave the vets until the morning, as thought by this time that she was probably going to be OK. I hadn't actually seen what had happened, and thought maybe, rather than being trodden on, maybe she had just had a glancing blow, that had frightened her, rather than caused her any serious harm.
Next morning her foot was very swollen, but she was still putting weight on it, took her straight to vets, and he confirmed that she had broken at least one bone in her foot (he could fell the bone moving as he manipulated the foot, and to be honest, I could see it too

). He asked if I wanted the foot X-rayed, but said it would only comfirm what we already knew! He put a really big dressing on the foot- the equivalent of a plaster cast, which had to stay on for six weeks (being changed regularly of course), and she was restricted to lead walks for that time. He gave her check ups every other day for the first two weeks, to make sure that all was going well, after that I only needed to take her in for the dressing changes.
Once she had the dressing on to support the foot, you wouldn't have known there was anything wrong with her, she stopped limping almost immediately. She recovered fully, and has been fine on that foot ever since.
I really thank my lucky stars that I have a practical vet who doesn't insist on making a mountain out of a mole hill. I know other vets who would have given her a GA, X-rays and the works, which was not neccessay, on that occassion.
But just goes to show, dogs will cope with all sorts of pain, and not neccessarily show the extent of their injuries, in the same way we would.
Hope everything is OK with your boy. Let us know what the vet says. Good luck.
K.