I just got a fancy blue rat from Petco and every time I pick it up or it gets excited it starts makeing a "chirping" sound and sneezeing alot. Is this normal? I have only had one rat before this one and she didnt do this, but my other rat was a female and this is a male. Could that make a difference? Please help, I dont want to have to take the lil guy back to the store for any treatment if I dont have to.