Hi, I have recently changed Nettle from Purina puppy to burns puppy over a 7 day period. She seemed fine. But over the last couple of days she has had a little blood at the end of her poo. Every poo. she has 3 meals a day and 3 poos. It is not runny and she is not poorly, eating, playing etc.. should I put her on rice and chicken and slowly re-introduce the burns. I dont think she needs the vet as she seems fine. She does seem to strain a lot at the end of going. Iseem to remember Jasper being a bit like this as a pup. Any advice welcome please.