Our choc. lab puppy is not feeling well. She is 4 months old. She started acting funny yesterday when she bit me, then last night she peed on floor (she's potty trained outside). When we did take her outside she would squat to pee then up to poop then down to pee again. She's been lethargic, but at the same time really playfull. She pants continuously and drinks way more than usual. She has alsow been knawing at her metal kennel (never done before) Vets tested her urine and found nothing. What could these be symptoms of?