my dog's neck swelled up while i was at work she was outside. lame and tired drooling, no bite marks, drank water had trouble. took to vet blood work showed elevated white blood cells. sometimes lyme disease goes undetected. the vet prescribed cephalexin tues evening. i gave her a 2nd dose wed morning she was more swollen around and under jaw and neck. she ate a little chicken with antibiotics drank a little bit of water, laid in same spot for days. i found a deer tick last night. this morning i gave her a 4th dose of antibiotics , swelling has become liquid under jaw some side swelling has decreased minimal. she doesnt want water just lameness. i am following up at 3 today more blood work, maybe switch from cephalexin to doxycycline? maybe gland biopsy? the onset was within hours and extreme plz help us