My Invisalign fell off the counter while I was eating. My dog chewed them up I only have 8 more days of 1 tray. Can I put 2 in?

Yes, try in tray #2.  Since you were not even one week into tray #1, this second tray will probably be VERY tight!  You will probably have to get it as far on as you can and gradually squeeze it on all the way by biting down.  It will probably make your teeth very sore!If you can't tolerate it, tell your orthodontist what happened and they may be able to order a replacement #1 tray.LEARN from this! Don't leave aligners out where they can be broken or thrown away or eaten by the dog. If the aligner had been in your mouth (like it's supposed to be - at least 22hours per day!), you wouldn't have this problem!Good luck!

If #2 goes in and isn't too tight, then proceed.  If it's intolerably tight, call your orthodontist and get a replacement #1.  In either case, why not call the orthodontist and follow their directions anyway?

If the next tray in the series fits (albeit tight) and seats completely on the teeth, you should be able to move ahead.  However, I would recommend consulting with your dentist/orthodontist as well.  If they feel the teeth are not tracking well (fitting within the next aligner) a replacement aligner can be ordered from Invisalign.