- I have been gardening today and came across heaps of these spiders in my garden, not realising at the time what they were. Last week, my dog came out in a huge ulcer under her collar, which has resulted in a very infected welt which has spread to the eyes, ears and stomach. We saw the vet and have been treating with antibiotics and bathing however it is only healing very slowly. The vet thought it was a "hot spot" however I am now wondering if she has been bitten by one of these spiders. Is it likely a dog would have similar symptoms to some humans and if so, would the treatment be any different?