Hi!
Have you been syringe feeding your guinea pig or hasn't it eaten for a week? Guinea pigs usually do not eat after dental treatment. Bloat can be a result of them not eating well because of overgrown teeth, but their mouths are very sore afterwards so they won't eat straight away. Bloat is very painful, so it doesn't encourage eating, either, and neiterh does baytril. However, the less a guinea pig eats, the faster the teeth overgrow again. Since guinea pig teeth are ground down by the extemely abrasive silica in hay (which makes 80% of the daily food intake), they have the fasted growing teeth of all rodents.
Please step in with syringe feeding NOW if you are not already doing it. The guts can go into stasis (slow down and stop working altogether) if a piggy is without food for too long. You can use mushed up pellets in an emergency, but you need to prep the syringe tip as shown in our guide in order for the fibre to come through.
If you are dealing with acute bloat and the tummy is very tight and hollow sounding, you really need to see a vet as soon as you can. Massage/vibrate the tummy gently to help shift the gas. The handle of a cheap electric toothbrush from a supermarket is the easiest available.
Please see a vet asap for gut stimulants (zantac and emeprid/metoclopramide to help with shifting the gas), painkiller and recovery formula if you haven't some at home for syringe feeding.
Please do not home treat with buscopan. it can make things owrse instead of better.