I would say it is definitely too hot. If your pup has had all vaccinations you can go directly to a grassy area (you carry the pup) and give command to go potty, pick the pup back up and go back inside. You can always let your puppy wear the harness inside attached to a leash and hooked to you.
__________________ Meg, Mom to Raley 
megraley.scentsy.us |