I too have noticed more dogs, only a few times have I had a concern, once when there was a large dog in first class, who decided to lay in the aisle and the flight attendant had to work around him. But by far the worst was a lady with a medium sized dog sitting in an aisle seat in Comfort Plus on a flight from ATL to SJU. The dog relieved itself in the seat and all over the aisle which was beside the bathroom. It was an awful smell and all the flight attendants except for one couldn't handle the smell. The one FA worked very had try to clean up the disaster. At the end of the flight I gave her one of my recognition coupons since she was so professional and did the best from an awful situation.