I would go by the reference ranges that the vet gave you for the lab that he deals with.
I do not believe that Interceptor would cause ALT to go 200 points above high normal. It may raise bile acids though.
The BUN could very well have been dehydration. That wouldn't be uncommon, but I would not like seeing it even 2 poinds too high with the liver enzymes in question too.
There are so many things that can throw the ALT off. Try not to panic too much but I would definately recheck and do a BAT as soon as possible.
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