dog behavior kennel

I bought a pair of pig farm are acting strangely?

Ive got two pigs. I put in a pen and started acting strange. The little girl keeps falling off his front paws. They will walk and it looks like his front legs only to publicize and falls. Its been doing this every 5-6 minutes. They came from the pen and a kennel. The best performance but not disappeared. What could be the problem? My first thought was treated wood used to building boom?

Treated wood is … considering that the wood has a lot of different chemicals and chemical products are very, very bad for pigs .. and other animals …

Adopting a dog from a Commercial Kennel Part 1