Hi Krista,
First--you need a bit more information about the sounds you're hearing...see if you can describe them in a way which matches what I found in this synoptic key:
Heart, circulation and pulse, anxiety, with :
Aco., Arn., Ars., Aur., Calc-c., Carb-v., Dig., Pho., Plat., Pul., Spig., Sul., Ver-a.
Heart, circulation and pulse, heart-beat and pulse, intermittent :
Ars., Carb-v., Dig., Kali-c., Mur-ac., Nat-m., Pho-ac., Ver-a.
Heart, circulation and pulse, heart-beat and pulse, palpitation, anxious, nervous, etc. :
Aco., Ars., Aur., Cof., Cratae., Dig., Lach., Nat-m., Pho-ac., Pul., Spig., Val., Ver-a.
Or you could take a look at this synoptic key yourself at
http://homeoint.org/books2/bogersyn/heart.htm
Nothing in the rep's listing may represent the symptom you're seeing well enough, but it is worth a look into these old books on occasion. They can often be more precise where physical symptoms are concerned.
Anything else that's characteristic about this kitty?