Hi! I'm New and have housebreaking issues

  
Foxy

1278845
 
 
Barked: Sun Dec 16, '12 9:12am PST 
Foxy is 3 months old and our first jack russell terrier. In fact, she's the first small dog I have ever owned. My previous dogs were all fairly easy to housebreak but Foxy is proving herself to be stubborn in that department. The vet said she should "graze" for eating instead of set times because she is so small and will not eat very much in one sitting but that's making it hard to know when she has to go. And she sniffs all the time so that's hard to tell. When I take her outside she may or may not do her business...she prefers to play and then wait till she's back inside to go to the bathroom. Any advice?