Hi I am new on this site but wonder if anyone can give me advice on my 6 year old boxer dog. Over the last few months I noticed a small lump on herback leg (near her hip) and just assumed it would go away. It was soft so I assumed pretty harmless. However I have noticed in the last week or so it has got so much bigger and seemed to have developed in to two lumps which are leaking a bit. Anyone ever seen this before?