Check with a specialist about the tumour. Is it definitely contained in the toe? If it's spread I wouldn't have it cut into as I feel that this can set off increased growth. As to having a toe removed, one of my bitches had a toe on her front foot removed because it was badly damaged. The vet said that she would always limp but she was back in the show ring after the operation and not one judge she went under noticed the missing toe! She moved as perfectly as ever.
Just spotted Basenji.co.uk is for sale
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It was at www.Basenji.co.uk, might be cool to own but not sure what I would actually do with it besides put photos of my dog on it so maybe not lol, if I was a breeder it would be useful i guess