A. IF behavior is normal and there is no pain you could monitor for any changes until you can get an appointment with your normal vet but if there is any fever of discomfort he shoukd be seen as an emergency. If the two sides and uneven this may be because or a mass growing (abscess or tumor for example) or due to muscle loss making the bone appear more pronounced. Rapidly growing lumps are always a concern and should always be checked by a vet and sampled where necessary
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