Hi my rabbit is a mix bun of a rex and new Zealand and he is already fixed and he just turned 2 this month and at first i thought it was gas cause i would give him tummy rubs and i could feel and hear bubble's being popped inside and he ate his veggies fine but not his hay and he keeps like licking his lips and has his ears down and that went on for 3 days and it stopped no bubble sound in the stomach but he still acts the same and not his happy self and his poops are small then they go back to normal size then small again i have a vet appointment the 31st. Does anyone know or experience this please tell me what u think it is and i think maybe teeth problem from what i researched