We have a working collie who is much loved and a fantastic worker - she is 12years and is just starting to slow down.
I have just gone to hose her down tonight cos she is filthy and had to fetch a calf out of the musk heap so you can imagine what mess she had got in!
Dp was holding her as she can be very a bit nippy and I was washing her belly off and I found a seriously HUGE mammary tumour
Not only is it the size of a grapefruit but its ulcerated as well and it stinks 
I can't believe we haven't noticed it before it got to this stage - I can only think its cos shes long haired and she lives outside (her choice). Believe me I'm beating myself up about this....
So I guess what I want to know is what will the vet tell me tomorrow - I will book her in first thing - she doesn't seem to be in any pain and is curled up in the straw in the calf pen where she always sleeps, shes eaten as normal and doesn't seem to have lost any weight. I'm assuming they will operate - is it successful or would we be better to pts now rather than put her through an op.