you can train indoors. if it's to hot for a lot of outside activities
do inside things.
some things you can do indoors:
> teach your pup not to door dash.
> reinforecement training.
> teach him not to counter surf.
> teach heeling.
> walking on a leash.
> teach him "go to your crate" on command.
> "find it". hide something and teach your pup
to find it.
> teach him "go to your crate".
> retrieving games.