I havent checked his gums but will do. What am I looking for?
Healthy gums are pink, warm and moist. Not red, not hot, not dry, not pale especially not grey and not pasty. Not tinned salmon pink neither - old-fashioned 'pink' (the border flower, like a little carnation) pink. You'll know if they're healthy when you look at them.
You can look at the membranes in the eye if the gums are difficult (or black!) Kind of squeeze up the upper lid and look at the pink (hopefully) in the corner of the eye or on the underside of the lid.
And as Rosemary says, they don't hunt less because they have a comfortable loving home, quite the reverse. If they are warm, well-fed and happy they will hunt for pleasure. If they are cold, uncomfortable, hungry they may not have the energy to hunt, and if they do hunt it will be for food. Rats are not their favourite food. Go figure... and keep on loving Toby and Polly, they - and you - deserve it!