I have recently just wormed my 7 months puppy and have started 2 put her in a large cage when we go out as she poos in the house. Since this has happened(bout4 days ago) I have noticed blood in her poo tonight for first time. Have been told a number of things could be stress wiv cage worming her etc, and just wondered any advice before take her vets!!

Sadly no one on this site can give you a definite answer, a trip to the vet is your only option.

Good luck.

Yes, the vet is the way to go. It may be caused by the wormer, but there are also other much more serious things that could cause this and no one can diagnose your puppy online. Better safe then sorry!