What size heat pad to buy?

[janejohn]

I'm just about to order a metal heat pad from Petnap and notice they have two sizes:-

               22cm x 33cm   or  44cm x 33cm
               8 3/4"  x  13"       17 1/2" x 13"

My whelping box is 3" x 3" ... so which one should I go for? Not sure if the first one will be a little small?

Thanks for your help.

[Gilly]

I would go for the 2nd size, the first one sounds like a Cat size one to me.

[AnnieM]

I got the bigger one in a 30" square whelping box and it is just the right size so the bigger one will be best. 

[janejohn]

Many thanks both of you.

Have ordered the larger one!