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Location: Virtual Showground
Joined: Aug 2006
Posts: 9,518
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This is shouting to me that first thing to do is a thyroid panel :
Hypothyroidism. Insufficient thyroid hormone production caused by disease of the thyroid glands. Symptoms include hair loss, obesity, lethargy, cold intolerance and skin infections.
More indepth reading here, pertinent to aggression which you could maybe print out for them :
http://www.beaconforhealth.org/Thyroid-Aggression.htm
Whether it turns out to be a thyroid problem or not, [ and bearing in mind I dont have the benefit of having seen him in the flesh ], I do think there is a health issue at source here, he may be in pain or even just mild discomfort and the scabs could well be just a symptom rather than the cause.
Yes many collies can be laid back / relaxed dogs but this sounds a bit deeper than that - a dog which is generally laid back doesnt tend to be snappy or grumpy - but one which is more in the realms of lethargic - particularly of a more usually very lively `hyper` breed - certainly can be.
Re the Frolic - as I understand it the sugar content is rather high, [ I can`t for the life of me find info on the actual contents and content percentages ], and there could easily be something else in there causing a problem to him which might be affecting skin or yes even temperament.
So first things first I do think whats happening warrants a trip to the vet for a full and thorough health check - I would advise not just any vet be consulted either, but a particularly collie savvy one if possible, and preferably an additional one-to-one with someone from a collie rescue who will have seen all sorts of collie behaviours both health and non-health related who should be able to assess and advise on working through things, and / or a collie-savvy behaviourist.
Sorry to bang on about `collie-savvy` but it really is relevent ime.