I think Fatimus has 'woman' problems 
She's had a lump on her abdomen for a while. It hasn't caused her any discomfort until now.
From past experience of Smartie Button's (RIP) lump removal I knew she would miss out on summer on the grass.
However things have changed. She is now leaking wee all the time. She is permanently wet underneath. The wet is making her cold in the evening air. Their 'summer house' is attached to their run. By evening time they go in and snuggle in the hay. Naughty Girl is cosy and warm but Fatimus is damp and chilly
. As you know they are house piggies and they are in from evening onwards.
So a busy week ahead. Getting kids back to school routine. I'll drag Old Boy's hutch out the garage and give it a scrub. I'm sure vet will remove lump and Fatimus will need to recover in a separate hutch but still in view and wheeking distance of Naughty Girl.
Why do they always need the vet when cash is short? Bugger 