Hi there! We have a three month old Vizsla named Greta. She is just amazing. However, we found out today that she DESPISES the rain.
LOLZ! this is too funny! Only because you'll find that MANY vizslas hate the rain, if they are inside and it's potty time.
Aly was/is the very same way! A little difference: Being in upstate NY, Aly didn't see rain until she was about 5 months old. Before that, it was all snow.
Regardless! As I did with Aly at three months old, no matter what the weather was....put the appropriate coat on. Potty break every hour! Goto her normal spot. Interact with her and talk to her (I even brought out rubber type toys, to give her something besides the rain to have a little focus on). If she doesn't eliminate after five or so minutes, back inside for 10 or 15 minutes as you watch her closely... then back outside ya go.
It won't be long and Greta will better understand when you goto her potty spot, it'll be expected she "performs".
At three months old, it's quite a critical time in their potty training. Yes, what I've described is time consuming! Though, consider it an investment! Right now, most important is that you setup Greta for success. Don't fret! Greta will learn, she's not made of sugar and will melt in the rain.
To date... Aly now being 19 months old... she STILL hates going outside in the rain to go potty! Though, now... I let her decide how bad she's gotta "go"! As, she hasn't made a potty "mistake" since she was 2.5 months old!