Sudden humping?

[puglouie]

Another thing that Louie's been doing lately.

Any idea why dogs start doing this? Is it an old age thing?

[Daisy's Daddy]

Just a guess - a few weeks ago you posted that Louie was finally feeling better and showing Chamuco who's boss. Humping can be a dominance thing and Louie may finally be feeling strong enough to show Louie he's the boss. I'm no expert by any means, and I know you've got some other weird issues going on with Louie, so I could be wrong.

[SallyAndTilly]

Another possibility is that there could be a female in heat in the area.