HI. I have a springer spaniel border collie cross who is 14mo's old. He is an outside dog. 6 days ago when I got home from work I noticed he had been bleeding from the back end. He won't let us lift his tail and he is very tender by his tailbone. He tries to bite us if we lift his tail. There seems to be no evidence of getting hit or anything. He seems real sheepish towards us now too. Anytime he tries to go to the bathroom he cries and yelps. Any advice or suggestions on what this could be? His appetite is fine. He's not the same dog anymore, not sure what happened. He used to be excited when he'd see us but now he just wants to lay around. Thanks, Cheryl

