A 90°F day is a different experience for a dog than for you. They cool themselves almost entirely through panting, which becomes less effective in humidity.
Adjust the schedule
Move walks to early morning or late evening. Skip midday outings in summer entirely if temperatures climb above 85°F.
Check the pavement
If you can't comfortably hold your hand on the sidewalk for seven seconds, your dog's paws can't handle it either.
Always offer shade and water on outings. Frozen treats and cooling mats help indoors. Watch for signs of overheating: excessive panting, drooling, bright red gums, stumbling.