If it turns out not to be allergies, look for ants.

My old dog refused to go onto the grass & ended up peeing all over our house. It didn't take me long to find why he was scared of the grass. there were millions of ants! The ants must have been bitting him

I found that hot water & lots of soap keeps them at bay & he sarted to pee outside again.

I noticed this year that the ants are MUCH MUCH worse then I have ever seen. Every yard had ant hill everywhere, & the one in my old backyard (just moved) was about a good 12 feet long