The 'Real Housewives' star (and her pup) joined "TMZ Live" to give us the lowdown on this weekend's festivities in West Hollywood, which raises awareness about global dog abuse.

Lisa tells us, "World Dog Day' is a real feel-good factor ... especially coming amid some very tough times in America, around the world ... and even for Lisa's charity Vanderpump Dog Foundation.

From the sounds of it, it'll be a whole 'lotta fun ... Lisa says, they're doing it big for all the furry folks -- live music and a DJ, vendors with doggy treats ... also a dog water park, pie-eating contest and even a fashion show with dog models!

While the foundation puts on a great show for pleasure, it also gets down to business too. The org has rescued and adopted over 2,300 dogs domestically and hundreds internationally ... even more of a reason to celebrate!

This year's event is co-sponsored by WeHo as a part of the city's celebration of Pet Week.