The Bottom Line…

Anal Impaction:

A condition mostly seen in older boars. Guinea pigs are coprophagic, meaning they eat their soft droppings as part of the digestive process.

These droppings are retained in the anal sac while the dry hard ones are pushed out.
The soft caecal pellets contain the B-Complex vitamins and are important to the guinea pig’s health.
Get used to how your guinea pig feels in that area. Ordinarily it will feel soft/mushy, impactation feels like a hard lump/bolus.
When impaction occurs it is because the muscles have stretched/weakened. Both types of pellets can become trapped in the sac.
These must be expelled and fed back to guinea (soft pellets) in order for him to remain healthy.
Ask your vet to do the first clear out then clean out the sac regularly as needed, which may be twice daily or even just weekly.
Gently push down on the anus and ease the mass out. Take care when doing this, do not force things too much!
The condition may clear after a while but often it just improves.
Feed a low protein diet with lots of good hay.

Bert n Ernie