Hello. I'm really worried about out new guinea pig. He is 8 weeks old. We have had him for 2 weeks and he has successfully bonded with our older male guinea pig. They have been very happy together. He has been eating drinking and pooing normally. Tonight after handling him for a short time we put him in the cage and it looked like his back legs gave way and he fell on his side and struggled to get back up. I have checked him a couple of times since and he is able to move along but it looks hard work and he fell over onto his side again. I also wondered if his tummy looked a little bloated. I can take him to the vet tomorrow lunchtime. But am very worried. Does anybody know what it could be?