Thank you for all your inputs, I think that the problem with Clara is more than arthritis because she has great strenght on her legs and pull hard then few minutes after during a 300 mts walk one of her front or back legs give in and she landing on the ground hard

Some times she walks moving her spine like a worm limping on one front and one back leg.
Early in the morning she asks for a walk and after 200 mts she is panting like if she was running for a long distance.
I have the impression that there is something wrong with her heart.
See what happens next friday @ the vet.
Cheers
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