My little Limabean (18 weeks) has been acting strange. She has been stretching her neck out and opening her mouth really wide. It looks like she's yawning almost. Then she shakes her head a little. She did it before when younger, but it just seems so strange now to see it again. Searching here links the "yawning" to gape worms. What/how do you worm for something like this? She's otherwise normal. No mucus. Eating and drinking normally. Same growth rate as everyone else. Should I be treating for gape worm, or am I overreacting?