We have a youngish nearly 2 yo female gp who has a mammary tumour next to her nipple. She’s already had a biopsy (inconclusive but the vet thought it wasn’t a good sign due to bleeding from the nipple). 2 weeks ago she had an operation to remove all the lump. It’s returned already - a new hard small lump and bleeding if you squeeze the nipple.
Don’t know what to do. Going to try and find a second opinion from an exotics vet. The coats can’t be ignored either - £350 so far, another op would be another £250, plus another biopsy would be £100.
Does anyone know if these things metastasize in guinea pigs? To make matters worse we’re off on holiday on Tuesday so she couldn’t have another op for a couple of weeks anyway.
Feel so guilty 
, what do I do?