I think my 4 y/o lab, Simon, has one of these between his toes. I tried to take a photo to post but he wouldn't let me move his paw to get a good pic. We trained yesterday and he ran quite a bit in the fields. I noticed last night that he was limping a bit. This morning he was really limping a lot and his paw was extremely swollen. This evening I noticed that he now has a large red nodule between his two toes on his front paw. Just wondering if this sounds like an Interdigital cyst. I am taking my 1 y/o, Miles, to the vet tomorrow for vaccines and wonder if I should bring Simon along to have it checked out or wait for a few days. Could it just be an irritation due to something he stepped on yesterday in the field and it would go away on it's own? Opinions?