We found our Collie (Molly) with a very bloody neck this evening! On closer inspection there was a small tick which I removed, and I found a huge lump with a raw area with a small slit in the middle. The vet thinks it is a secondary infection from a snake bite probably, and a collegue to the vet said she had seen something very similar last week (on another collie). I suppose the hot weather may have brought the adders out. (I know nothing of these creatures.) Molly goes to daughters livery yard at least twice a week, and is walked by a golf course daily by me, all possible areas for snakes.
Be aware dog walkers all.