It sounds like an abscess, Tumours usually do not get that large in just a weeks time, it is really rare.


An abscess is a swollen area on the body that is full of puss and bacteria, it is infected. It can start out by just a tiny scratch or a bite wound. Sometimes if it is really bad the animal will have to have it surgical opened up and drained, but for small ones they usually pop within a few days and heal quickly with antibiotics. I usually just drain the abscess myself, cleanse it with some saline solution and neosporin and it heals within a few days. But don't try this yourself if you've never done it before, which I am assuming you haven't lol.


The vet can tap the area to see if it is an abscess or a tumour. If the needle doesn't draw any fluid it is a tumour, if the needle comes back with either puss or blood it's an abscess. Hopefully it's just an abscess and you can treat her with antibiotics. You should take her to the vet though because like YLL said tumours can grow large very quickly and CAN claim her life! Not all tumours can be surgically operated on though and you just need to make them comfortable for as long as possible until it is time to let them go.