There are also doggy diapers. Check out
www.petedge.com and/or
www.petsmart.com or you can google it. Please don't give up on your baby and get rid of her -- would you expect a 5 month old child to be fully potty trained? Of course not - it takes a long time but you can definitely get there. Please let me know if you need any other info or help. Good luck w/ your baby.
