My vet just prescribed Tramadol, for my 6 pound Chihuahua! She told me to give her 0.5 ML orally, twice a day! I've noticed that her breathing is a little fast, and her heart seems to be racing a little. Is this normal, or do you think the dose is too high, and I should take her back in to the vet, or am I panicking for no reason? Thanks!