Hello there... My baby Meka went into heat last month (8 mo.) and it was quite a learning experience. I bought her some diapers from the pet store, size small and I still had to cut em' a little to fit her comfortably. There's a few members on here that sell diapers...and I'll be looking into how much they charge for em'. I think they might be a little more comfortable for her. Meka's heat lasted a little over two weeks! But every pup is different... I hope this helps