Dragging claws whilst walking

Occasionally whilst we are out Coco will catch her claws on the tarmac whilst walking, giving a little scrape. It is one of her back legs but as she is at the side of me I can’t tell which and she only does it a few times over a whole walk and it can be minutes apart. She has also had the odd grumble if I have touched her back legs when she has been sat with me in an evening, though there is no sign of anything amiss – no limp or sores, so I haven’t rushed to the vet yet.

Is it just a lazy gait where she isn’t picking her foot up properly or could it be an indication of something wrong? I haven’t noticed her doing it off lead, but I don’t spend as much time in such close proximity at a slow pace.

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