Not walking right, no injury, help please.

Question
Theo is 3 years old and just yesterday I noticed him walking awkwardly.  He seems stiff and his back legs only move together (as if hopping or dragging his legs).  I believe he has a good diet (greens: no iceberg lettuce, apples, peppers, carrots).  He has not fallen or been hurt.  Any ideal what could be wrong or advice on how to take care would be great.  Thank you soooo much.

Answer
Hello Kelly,

If he has not improved, he should see a vet. Insect bites, certain infections, lack of a certain vitamin, injury, as well as issues with the brain (such as a mild stroke) could cause issues with how they walk. Most problems are easily treatable but can be serious if let go so it is good to see a vet soon. Good luck.

-kkat
http://www.geocities.com/abyssinianguineapigs