The hips are NOT more lax when a bitch is in heat! There's a reason that the canine pregnancy test measures levels of RELAXIN in the blood, which is only present when the bitch is pregnant! This is the hormone that causes laxity in joints. My repro vet has no problems xraying a bitch in heat - I've done it several times - Excellent hips each time!
I have to agree with most posters here. My girl came in season a week after the x-rays were taken and she came back Excellent Hips and Normal Elbows. Of course, I had an x-ray tech who knows what she is doing :)
