my brother was looking after the dog we think shes in heat as when she normaly comes in to heat she gets nippy also the chiwawa could not fight back as she had no teeth ans her back end was not working properly and the vet said she was fine and would not let my mm have the dog put down the week before as her back legs did not work so my mum had her bookd in for the next day but the jrt got ther first also we were not in the house when this happend