First, I'm not a doctor. So take this with a grain of salt. 153 over 53 although a bit odd as 153 is a tad high and 53 a tad low, doesn't seem to be in and of itself something to be concerned with. 120/80 is considered optimal. So just looking at the numbers I wouldn't worry, however it certainly doesn't hurt to shoot a quick call into your Doc to see what he/she says. I'm curious to see what other vets say about this though.