We have a cow that has had a limp for over a week. If you pick up her foot, you can see a dark blue/purple spot (1/4 inch in diameter) that looks like a bruise in between her toes just above the hoof. We took her to the vet and he gave her a shot of LA 200 and told us to give it time. However, she hasn't improved. Does an abcess look like a bruise? We will be taking her to a different vet if she is not better in a couple of days.