I don't know about traveling (yet), but we have four now. My Maggie had 3boys and I only sold one(to a YTer! yeah!). So we have a 3 year old, a 2 year old and two 8 month olds. it is definitely harder, but I wouldn't change a thing. We are a Pack now and lovin' every minute of it.
I just started a thread and put up some awesome websites, worth repeating though!
Dog, Cat & Other Pet Friendly Hotels at Petswelcome.com PET-FRIENDLY TRAVEL ♡ SEARCH ENGINE
Hope this helps!!!