i've had my guinea pig for a few months now and only about a week ago or two she started to itch her self a lot and bite. she has no signs of mites or lice, no hair loss, no appetite loss, no bold patches, not sensitive to touch, nothing. she just itches and scratches a lot like.. 1 time every 5 mins or so? i checked her hair and it was clean and there was no lice. i clean her cage regulary every 3 days and use wood pellets as bedding.. could she just not like the bedding? or something in her cage? ~ please help i don't know what to do