Do you think the nails are catching on things after the trim because the trim isn't clean? or perhaps this condition I copied for you from SLO site. They have a group on Yahoo
SLO is an autoimmune disease of dogs which can cause severe claw problems in otherwise apparently healthy dogs. It is characterised by the loss of claws from more than one paw - eventually all claws may be lost. Other symptoms may include: receding quicks, secondary infection (often with a strong smell), claw splitting (usually down the back of the claw), pain, distorted/twisted claws and lameness.
A firm diagnosis can only be reached by the biopsy of a claw, dewclaws usually being used for this. In the absence of an available dewclaw it is necessary to amputate a toe at its bottom joint in order to do the biopsy. In many cases, this is considered an extreme step to take, and is not strictly necessary. If the dog is showing signs of SLO, treatment using the latest protocols can be started - if they work, it largely confirms the diagnosis, even without the biopsy.
Modern treatments include the use of essential fatty acid (EFA) supplements, antibiotic treatment with tetracycline and niacinamide (nicotinamide). Removal of claws as they become loose can help to alleviate pain, but generally isn't necessary. Although there are few studies to scientifically confirm the results, the treatment appears to be effective. Once the disease is in remission, supplementation may need to be continued for life to prevent relapse.
SLO can appear in all breeds, including crossbreeds and mixed-breeds, although some breeds seem to be more susceptible than others. It is not infectious or contagious - other dogs which come into contact with it cannot contract it. It appears to be spontaneous, and there is no evidence of an hereditary factor - because of the absence of studies and the small number of known cases though, there is little proof of this other than anecdotal evidence.
It is likely that it is a newly-recognised old condition, rather than a new disease. It is probably more common than it appears, because in many cases it is not diagnosed correctly. In response to the lack of information available, a number of owners of dogs with this condition have gathered on the Internet to share information and support, and to discuss management and treatment protocols.
Owners of dogs with the condition, and anyone else who has an interest, can share support and information on the subject by joining the Canine Symmetrical Lupoid Onychodystrophy Mailing List, where they can discuss their problems with other owners, some of whom have been treating their dogs for many years.