
Sorry, should have made it clearer...she uses a ramp to get in and out as I don't want her jumping up and down. The ramp was in place and she would get as far as the top, where it was resting on the bumper and then refuse to get on into the boot. She would put her head in to get to the treats I was tossing in as a lure but wouldn't go for the ones thrown to the back of the boot as that would have meant she would have to get right in. She also refused to get into the back seat via the doors.
I don't think she is about to come into season but I could be wrong. I believe 7 months would be very early for her breed to come into season. She seems perfectly normal in herself otherwise.
I do worry about her hips simply because of her breed but as we are currently having a problem with her bouncing up and down like a kangaroo and trying to lick people's faces while they are standing up, I don't think her his are giving her any bother. I presume if she was in any pain, she wouldn't bounce so enthusiastically?
Anyway, it seems I may have posted a little prematurely. We tried her again this morning. I opened the boot, set up her ramp and threw in some dried liver. She hesitated for a second and then trotted up the ramp and into the car. I allowed her to get back out in her own time (once she'd hoovered up all the treats) and left it at that. I'll continue to do this without actually closing the boot or going anywhere for a few days to see if we can overcome whatever it is that made her so reluctant last night. Newfs can be a stubborn breed...perhaps this is the onset of adolescence (heaven help us :D )
Thank you all for your replies.