English Mastiff Pup Very Unstable back end

[FullBoat4u]

Hello. I have a 5 month old english mastiff female who over the past 2 weeks has become very clumsy aswell as very weak on back legs... her legs almost have a give out type of look as she walks sometimes... she has trouble getting up from laying aswell as taking small corners... also when she does run her back legs kinda stay together like a rabbit... first thought was hip displacstic dog forsure but i had x rays done and they look as good as ive ever seen in a mastiff to be honest.. so any imput would be great... i have an idea but i would love to hear from anyone with out stating what i think right away just so it does not influence you in your thoughts....

more dog info

Ruby
65lbs
5 months
24 inch tall at the shoulders
fawn in color
100% english mastiff with full pedigree on parents and grandparents on both sides with health checks and cert hips from all

[SnowDancer]

I would ask for a referral to a neuro. I will not speculate - vet would have seen what I am thinking even with a general X-Ray. Two weeks is way too long - actually action should be taken day one.

[mummummum]

Based on your description, I would've put money down on displaysia. On the updownside what does your Vet think of Wobber's?

Either way...can I recommend WARM water swimming and under-water treadmill therapy.