Pickles has recently (about a month ago) began obsessively sniffing anytime we are outdoors. He LOVES to just walk through the grass and sniff for hours on end, which wouldn't be a problem until it became excessive and he now gets nosebleeds, a sore nose, and has scarring under his nostrils from it. Within the last week or so he's began to do the same thing indoors. Any ideas on why he would do this and how to keep it from causing pain/scarring on his little nose?