I just noticed this spot on my cat, she got out yesterday, she's an indoor cat, but I just now noticed it, I don't know how I could have missed this. She had a similar spot on her chest when we first got her, she kept scratching it open again and again, but it healed after I got her to stop scratching. Any idea what may cause this? I'm also wondering if my dog may have bitten her, or something happened outside. My dog is not ferocious, I have three young kids too. But I'm worried seeing this on Sammy, the hole itself is about 1/4inches wide! And I can't see a bottom, just infection or drainage. I have been cleaning it regularly with the same stuff I use for my kids, bactine, and I want to cover it so she'll leave it alone. I am also going to remove hair from the area, in the picture, I don't know what caused the bald spot, but the same thing happened with the last one of these she had..