Hi Jane
My cocker Daisy experienced similar symptoms when we first got her - very runny mucuosy poo for a few weeks with spots of red which was apparently blood. In Daisy's case, just as a precaution the vet prescribed some panacur to eliminate the possibility of lungworm (as she had a slight cough at the same time). It is possible that if Bob Bon is a bit inflamed internally, the redness/blood could have been caused by the thermometer. Many pups experience diarrohea to some degree when first settling in to their new home, and hopefully this isnt anything to worry about. But of course, you should consult your vet just in case as I think it's better to be safe than sorry where pups are concerned.