Yes, we are booking a vet appointment ASAP. He is acting just as he was without it. He’s eating normal and will run around. We are just making sure he doesn’t hit his head so if it is an aneurysm, it won’t rupture. We were just away for a week and when we came back he had it, so I don’t know if he hit his head or not. One of the people who was taking care of him though sent a a picture of him and it looked like it was starting to appear. It was like half or 1/4 of the size it is now. Once it reached the size it is now, it hasn’t gotten any bigger, it’s just stayed the same size. I have also put VERY slight pressure on the lump and he didn’t show any reaction, so I don’t think it is hurting him at the moment.